Hot water roller, preheating oven and double-unwinding and double-winding spot coating production line

Abstract

The invention discloses a hot water roller, a preheating drying oven with the hot water roller and a double-unwinding and double-winding spot coating production line with the preheating drying oven, and relates to the technical field of coating processing, and the hot water roller comprises a first end cover, a second end cover, a roller body, a stirring piece and a transmission assembly. The first end cover is provided with a water outlet; the second end cover is provided with a water inlet; one end of the roller body is rotationally and hermetically connected with the first end cover, the other end of the roller body is connected with the second end cover, a hot water cavity is defined by an inner cavity of the roller body, the first end cover and the second end cover, and the hot water cavity communicates with the water outlet and the water inlet and is used for hot water to flow; the stirring piece is arranged in the hot water cavity; the transmission assembly is arranged in the hot water cavity, one end of the roller body is in transmission connection with the stirring piece through the transmission assembly, and the rotating roller body can drive the stirring piece to rotate reversely so that the stirring piece can stir hot water in the hot water cavity. The hot water roller can enable a film to fully absorb heat, so that the dispensing quality of a subsequent dispensing device is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coating processing, in particular to a hot water roller, a preheating oven and a double-release and double-collection spot coating production line. Background Art

[0002] The film preheating oven is a device used to preheat the film in the coating equipment. It can preheat the film to improve the surface quality of the film so that the subsequent coating device can apply the coating more evenly on the surface of the film. At present, the film preheating oven includes a box body, a water heating circulation mechanism, a rotary drive mechanism and a plurality of hot water rollers for winding the film. The rotary drive mechanism is used to drive the hot water rollers to rotate at the same time so that the plurality of hot water rollers can pull the film. The output end and the input end of the water heating circulation mechanism are respectively connected to the water inlet and the drain port of the hot water roller to realize the circulation of hot water in the hot water cavity of the hot water roller, so that the hot water in the hot water cavity can transfer heat to the roller wall of the hot water roller, and then the roller wall of the hot water roller can transfer heat to the film to achieve the purpose of preheating the film. Under the conveying action of the water heating circulation mechanism, hot water only flows from the water inlet of the hot water roller to the drain outlet, resulting in a relatively simple water flow state of the hot water in the hot water chamber, so that only the heat of the hot water near the inner wall of the hot water chamber can be transferred to the roller wall of the hot water roller, while the heat of the hot water near the middle of the hot water chamber cannot be quickly transferred to the roller wall of the hot water roller. In addition, the film wrapped around the hot water roller will take away part of the heat of the roller wall of the hot water roller, so the roller wall of the hot water roller will heat up slowly. Since the conveying speed of the film in the spot coating device is fast, when the roller wall of the hot water roller heats up slowly, the film will not be able to fully absorb heat when it contacts the hot water roller, which will lead to a decrease in the surface quality of the film, thereby reducing the spot coating quality of the subsequent spot coating device. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a hot water roller, which can make the film fully absorb heat to ensure the surface quality of the film, and further ensure the coating quality of the subsequent coating device.

[0004] The present invention also provides a preheating oven having the hot water roller.

[0005] The present invention also provides a double-release and double-collection spot coating production line having the above-mentioned preheating oven.

[0006] The hot water roller according to the first embodiment of the present invention comprises a first end cover, a second end cover, a roller body, an agitator and a transmission assembly.

[0007] The first end cover is provided with a drain port; the second end cover is provided with a water inlet; one end of the roller body is rotatably sealed and connected to the first end cover, and the other end of the roller body is connected to the second end cover, the roller body is used for winding a film, the inner cavity of the roller body, the first end cover and the second end cover are enclosed to form a hot water cavity, the hot water cavity is connected with the drain port and the water inlet, and the hot water cavity is used for hot water to flow; the agitator is arranged in the hot water cavity, and the axis of the agitator coincides with the axis of the roller body; the transmission assembly is arranged in the hot water cavity, one end of the roller body is transmission-connected to the agitator through the transmission assembly, and the rotating roller body can drive the agitator to rotate in the opposite direction, so that the agitator stirs the hot water in the hot water cavity.

[0008] At least the following beneficial effects are achieved: The film is wound on the roller body. During the operation of the preheating oven, the rotary drive mechanism and the water heating circulation mechanism are started simultaneously. The rotary drive mechanism drives the second end cover on the other end of the roller body to rotate, so that the second end cover can drive the roller body to rotate, and then the roller body can rotate relative to the first end cover, and then the roller body can pull the film. The water heating circulation mechanism can drive hot water to flow into the hot water cavity in the roller body through the water inlet on the second end cover, and the hot water in the hot water cavity is discharged through the drain port on the first end cover to complete the circulation of hot water in the hot water cavity, so that the heat of the hot water can be transferred to the roller body, and then the heat of the roller body can be transferred to the film to complete the preheating of the film. During the rotation of the roller body, since one end of the roller body is connected to the agitator arranged in the hot water cavity through the transmission assembly, the rotating roller body can drive the agitator to rotate in the opposite direction, so that the agitator can stir the hot water flowing in the hot water cavity. Under the stirring action of the stirring element, the uniformity of the hot water flow in the hot water chamber is broken, making the flow of hot water in the hot water chamber more complex and diverse, increasing the disturbance of the hot water in the hot water chamber, so that the hot water near the middle of the hot water chamber can flow to the inner wall of the hot water chamber and transfer the heat to the roller body, that is, the hot water everywhere in the hot water chamber can flow to the inner wall of the hot water chamber and transfer the heat to the roller body, avoiding the situation that only the heat of the hot water near the inner wall of the hot water chamber can be transferred to the roller body, so that the roller body can heat up quickly, and then the film can fully absorb the heat of the roller body under the condition of fast conveying speed, thereby ensuring the preheating effect of the film and the surface quality of the film, which is beneficial to ensure the coating quality of the subsequent coating device.

[0009] According to the hot water roll of the first aspect embodiment of the present invention, the stirring member is a spiral blade, and a spiral flow channel for hot water to flow is formed between the spiral blade and the inner side wall of the hot water cavity. The rotating roll body can drive the spiral blade to rotate in the reverse direction, so that the spiral blade stirs the hot water in the hot water cavity and makes the spiral blade push the hot water in the spiral flow channel to flow towards the drain port.

[0010] According to the hot water roll of the first aspect embodiment of the present invention, the transmission assembly includes a gear ring, a sun gear and a plurality of planetary gears. The plurality of planetary gears are all rotatably connected to the first end cover. The gear ring is connected to the inner side wall of the roll body cavity. The sun gear is connected to one end of the stirring member. The plurality of planetary gears are all meshed with the internal teeth of the gear ring. The sun gear is simultaneously meshed with the plurality of planetary gears. The rotating gear ring can drive the plurality of planetary gears to rotate synchronously, so that the plurality of planetary gears drive the sun gear to rotate at the same time, and the rotation direction of the sun gear is opposite to that of the gear ring.

[0011] According to the hot water roll of the first aspect embodiment of the present invention, it further includes a first support frame. The first support frame is connected to the inner side wall of the roll body cavity. A first mounting hole is formed on the first support frame, and one end of the stirring member is rotatably connected in the first mounting hole.

[0012] According to the hot water roll of the first aspect embodiment of the present invention, it further includes a second support frame. The second support frame is arranged on the second end cover. A second mounting hole is formed on the second support frame, and the other end of the stirring member is rotatably connected in the second mounting hole.

[0013] According to the hot water roll of the first aspect embodiment of the present invention, a drain pipe is provided on one side of the first end cover away from the roll body. The drain pipe is communicated with the drain port. An inlet pipe is provided on one side of the second end cover away from the roll body. The inlet pipe is communicated with the water inlet.

[0014] According to the preheating oven of the second aspect embodiment of the present invention, it includes a box body, a water heating circulation mechanism, a rotation driving mechanism and the hot water roll of the above first aspect embodiment. A plurality of the hot water rolls are all rotatably connected in the box body. The water heating circulation mechanism and the rotation driving mechanism are both arranged on the box body. The rotation driving mechanism is used to drive the plurality of hot water rolls to rotate. The water heating circulation mechanism is used to make hot water circulate in the hot water cavities of the plurality of hot water rolls.

[0015] It has at least the following beneficial effects: This preheating oven has all the beneficial effects brought by the above hot water roll, and will not be repeated here.

[0016] The preheating oven according to the embodiment of the second aspect of the present invention further includes a hot air circulation mechanism, which is arranged on the box body and is used to make hot air circulate in the box body.

[0017] In the preheating oven according to the embodiment of the second aspect of the present invention, the box body is provided with a heat insulation layer, and a heat insulation medium is arranged in the heat insulation layer.

[0018] The preheating oven according to the embodiment of the third aspect of the present invention includes two continuous dot coating devices, one of the continuous dot coating devices is arranged above the other continuous dot coating device, and both of the continuous dot coating devices include an automatic unwinding device, a dot coating device, a pneumatic floating oven, a deviation rectifying device, an automatic rewinding device, and the preheating oven according to the embodiment of the second aspect above. The automatic unwinding device, the preheating oven, the dot coating device, the pneumatic floating oven, the deviation rectifying device, and the automatic rewinding device are arranged in sequence along the conveying path of the film.

[0019] It has at least the following beneficial effects: it is beneficial to improve the quality of the film products processed by the double-unwinding and double-rewinding dot coating production line.

[0020] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0021] The following further describes the present invention in conjunction with the drawings and embodiments, where: Figure 1 It is a schematic structural diagram of the hot water roller according to the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the first end cover of the hot water roller; Figure 3 It is a schematic structural diagram of the second end cover of the hot water roller; Figure 4 It is a schematic diagram of one end of the roller body of the hot water roller; Figure 5 It is a cross-sectional view of the hot water roller; Figure 6 It is an exploded schematic diagram of the hot water roller; Figure 7 It is a schematic diagram of the transmission component of the hot water roller; Figure 8 It is a schematic diagram of the film running on multiple hot water rollers; Reference Signs in the Drawings: First end cover 100; Drainage port 110; Drain pipe 120; Second end cover 200; Water inlet 210; Water inlet pipe 220; Second support frame 230; Second mounting hole 231; Roller body 300; hot water chamber 310; first support frame 320; first mounting hole 321; Stirring member 400; Drive assembly 500; gear ring 510; sun gear 520; planetary gear 530; mounting post 540. Detailed implementation manner

[0022] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., refer to the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0023] In the description of the present invention, if the first and second are described only for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0025] Refer to Figure 1 、 Figure 5 and Figure 6 As shown in FIGS., the present invention discloses a hot water roller, including a first end cover 100, a second end cover 200, a roller body 300, a stirring member 400 and a drive assembly 500.

[0026] A drain port 110 is provided on the first end cap 100; a water inlet 210 is provided on the second end cap 200; one end of the roller body 300 is rotatably and sealingly connected to the first end cap 100, that is, a seal is formed between the roller body 300 and the first end cap 100, the other end of the roller body 300 is connected to the second end cap 200, the roller body 300 is used for winding the film, the roller body 300, the first end cap 100 and the second end cap 200 enclose a hot water cavity 310, the hot water cavity 310 is communicated with the drain port 110 and the water inlet 210, and the hot water cavity 310 is used for the hot water to flow; a stirring member 400 is arranged in the hot water cavity 310, and the axis of the stirring member 400 coincides with the axis of the roller body 300; a transmission assembly 500 is arranged in the hot water cavity 310, and one end of the roller body 300 is drivingly connected to the stirring member 400 through the transmission assembly 500. The rotating roller body 300 can drive the stirring member 400 to rotate in the opposite direction, so that the stirring member 400 stirs the hot water in the hot water cavity 310. The rotating roller body 300 can drive the stirring member 400 to rotate in the opposite direction, that is, the rotation direction of the stirring member 400 is opposite to the rotation direction of the roller body 300. The two ends of the roller body 300 refer to the two ends in the length direction of the roller body 300.

[0027] In the embodiment of the present invention, the two ends of the roller body 300 are respectively rotatably connected to the box body of the preheating oven through the first end cap 100 and the second end cap 200. Specifically, the first end cap 100 is used for fixedly connecting to the box body of the preheating oven, the second end cap 200 is used for rotatably connecting to the box body, and the second end cap 200 is used for connecting to the output end of the rotation driving mechanism of the preheating oven. One end of the roller body 300 is rotatably and sealingly connected to the first end cap 100, the other end of the roller body 300 is fixedly connected to the second end cap 200, the film is wound on the roller body 300, and the output end of the rotation driving mechanism of the preheating oven is connected to the second end cap 200. During the operation of the preheating oven, the rotation driving mechanism will drive the second end cap 200 to rotate, so that the second end cap 200 can drive the roller body 300 to rotate around its own axis, and further the roller body 300 can play a role in pulling the film. In the embodiment of the present invention, the output end and the input end of the water heating circulation mechanism of the preheating oven are respectively communicated with the water inlet 210 and the drain port 110, so that the hot water can circulate in the hot water cavity 310 in the roller body 300, and further the roller body 300 can be heated by the hot water. The roller body 300 can drive the stirring member 400 to rotate around its own axis.

[0028] As an embodiment of the present invention, the stirring member 400 includes a transmission rod and a plurality of paddle blades. The transmission rod coincides with the axis of the roller body 300. One end of the roller body 300 is drivingly connected to one end of the transmission rod through the transmission assembly 500. The plurality of paddle blades are evenly distributed on the transmission rod, so that when the roller body 300 drives the transmission rod to rotate in the opposite direction, the plurality of paddle blades on the transmission rod can stir the hot water in the hot water cavity 310.

[0029] It can be understood that the film is wound on the roller body 300, and during the operation of the preheating oven, the rotary drive mechanism and the water heating circulation mechanism are started at the same time. The rotary drive mechanism drives the second end cover 200 on the other end of the roller body 300 to rotate, so that the second end cover 200 can drive the roller body 300 to rotate, and then the roller body 300 can rotate relative to the first end cover 100, and then the roller body 300 can pull the film. The water heating circulation mechanism can drive hot water to flow into the hot water cavity 310 in the roller body 300 through the water inlet 210 on the second end cover 200, and the hot water in the hot water cavity 310 is discharged through the drain port 110 on the first end cover 100 to complete the circulation of hot water in the hot water cavity 310, so that the heat of the hot water can be transferred to the roller body 300, and then the heat of the roller body 300 can be transferred to the film to complete the preheating of the film. During the rotation of the roller body 300, since one end of the roller body 300 is connected to the agitator 400 disposed in the hot water chamber 310 through the transmission assembly 500, the rotating roller body 300 can drive the agitator 400 to rotate in the opposite direction, so that the agitator 400 can stir the hot water flowing in the hot water chamber 310. Under the stirring action of the stirring member 400, the uniformity of the hot water flow in the hot water chamber 310 is broken, making the flow of hot water in the hot water chamber 310 more complex and diverse, and increasing the disturbance of the hot water in the hot water chamber 310, so that the hot water near the middle of the hot water chamber 310 can flow to the inner wall of the hot water chamber 310 and transfer heat to the roller body 300, that is, the hot water at various places in the hot water chamber 310 can flow to the inner wall of the hot water chamber 310 and transfer heat to the roller body 300, avoiding that only the heat of the hot water near the inner wall of the hot water chamber 310 can be transferred to the roller body 300, so that the roller body 300 can heat up quickly and fully absorb the heat of the hot water, so that the film can fully absorb the heat of the roller body 300 under the condition of fast conveying speed, thereby ensuring the preheating effect of the film and the surface quality of the film, which is beneficial to ensuring the coating quality of the subsequent coating device.

[0030] Further, during the rotation of the roller body 300, the inner sidewall of the hot water chamber 310 generates a first acting force on the hot water, and the stirring member 400 generates a second acting force on the hot water. Since the rotation direction of the stirring member 400 is opposite to that of the roller body 300, the second acting force generated by the stirring member 400 is opposite to the first acting force generated by the inner sidewall of the hot water chamber 310. Under the opposite first and second acting forces, the hot water forms a more complex flow pattern within the hot water chamber 310. This reverse stirring effect is stronger than that of the stirring member 400 rotating in the same direction or not rotating at all, and can more effectively break the laminar flow state and single flow state of the hot water in the hot water chamber 310, so as to promote the full flow and mixing of the hot water, enabling the hot water near the middle of the hot water chamber 310 to better exchange heat with the hot water near the inner sidewall of the hot water chamber 310, such that the roller body 300 can fully absorb the heat of the hot water in the hot water chamber 310 and quickly increase its temperature.

[0031] In the embodiment of the present invention, the axes of the drain port 110 and the water inlet 210 both coincide with the axis of the roller body 300. The hot water roller further includes a bearing and a rotary seal. The first end cover 100 is provided with a mounting flange, and the mounting flange extends into the inner cavity of the roller body 300. A bearing and a rotary seal are provided between the mounting flange and the inner sidewall of the inner cavity of the roller body 300. The rotary seal is located between the bearing and the second end cover 200, such that the roller body 300 can be rotationally and sealingly connected to the mounting flange through the bearing and the rotary seal. The rotary seal can seal the gap between the inner sidewall of the inner cavity of the roller body 300 and the mounting flange during the rotation of the roller body 300, so as to prevent the hot water from leaking out between the roller body 300 and the first end cover 100. The rotary seal is a common mechanical component, and the rotary seal can be a common elastic sealing component or a common mechanical seal, which will not be further elaborated here.

[0032] Reference Figure 6 and Figure 7, the stirring member 400 is a helical blade. A helical flow path for the hot water to flow is formed between the helical blade and the inner side wall of the hot water chamber 310. The rotating roller body 300 can drive the helical blade to rotate in the reverse direction, so as to stir the hot water in the hot water chamber 310 and push the hot water in the hot water chamber 310 towards the drain port 110, that is, the helical blade pushes the hot water in the helical flow path towards the drain port. It can be understood that, on the one hand, the helical blade can stir the hot water in the hot water chamber 310, effectively breaking the laminar flow state and single flow state of the hot water in the hot water chamber 310, enabling the roller body 300 to quickly heat up, which will not be further elaborated here. On the other hand, a helical flow path is formed between the helical blade and the inner side wall of the hot water chamber 310, enabling the hot water flowing in the hot water chamber 310 to flow along this helical flow path, extending the flow path of the hot water in the hot water chamber 310, enabling the roller body 300 to fully contact the hot water and absorb the heat of the hot water, thus facilitating the rapid heating of the roller body 300. On the other hand, the stationary helical blade will impede the flow of the hot water flowing into the hot water chamber 310, resulting in a decrease in the flow rate of the hot water in the hot water chamber 310, making the temperature in the area of the roller body 300 near the water inlet 210 possibly too high, while the temperature in the area of the roller body 300 near the drain port 110 possibly too low, causing uneven temperature of the roller body 300 itself, and then resulting in uneven heating of the film, so it is not conducive to improving the surface quality of the film. The helical blade in the embodiment of the present invention is rotating. Compared with the stationary helical blade, the rotating helical blade can generate a thrust towards the drain port 110 on the hot water in the hot water chamber 310, that is, the rotating helical blade can convey the hot water, eliminating the influence of the helical blade on the flow of the hot water, ensuring the flow rate of the hot water in the hot water chamber 310, ensuring the uniform temperature of the roller body 300 itself, and enabling the film to be heated evenly. It should be explained that the helix direction of the helical blade matches its rotation direction, enabling the helical blade to convey the hot water towards the drain port 110, that is, the helical blade can generate a thrust towards the drain port 110 on the hot water.

[0033] It should be further noted that when the spiral blade rotates in the same direction and at the same speed as the roller body 300, that is, when the roller body 300 and the spiral blade remain relatively stationary, the forces exerted by the roller body 300 and the spiral blade on the hot water will be in the same direction, causing the hot water in the hot water chamber 310 to mainly move as a whole with the spiral blade. That is, at this time, the hot water in the hot water chamber 310 is still in a single spiral flow state, resulting in a reduction in the stirring effect of the spiral blade on the hot water. As a result, the hot water near the middle of the hot water chamber 310 cannot be fully mixed with the hot water near the inner side wall of the hot water chamber 310, making it impossible for the roller body 300 to heat up quickly, thus affecting the surface quality of the film. In the embodiment of the present invention, the rotation direction of the spiral blade is opposite to that of the roller body 300, enabling the spiral blade and the roller body 300 to respectively generate opposite forces on the hot water, thereby forming a strong convection effect of the hot water in the hot water chamber 310, allowing the hot water near the middle of the hot water chamber 310 to be quickly and fully mixed with the hot water near the inner side wall of the roller body 300, and enabling the hot water near the middle of the hot water chamber 310 to quickly transfer heat to the roller body 300. Moreover, the forces exerted by the spiral blade and the roller body 300 on the hot water pull on each other, causing the hot water to no longer move in a single spiral but to be cut and squeezed by the spiral blade, forming a turbulent state. The strong turbulence greatly enhances the heat exchange efficiency between the hot water and the roller body 300, enabling heat to be transferred from the hot water to the surface of the roller body 300 more quickly. It can be seen that compared with the rotation mode of the same direction and the same speed, the reverse rotation significantly improves the heating speed of the roller body 300.

[0034] Reference Figure 2 、 Figures 5 to 7, the transmission assembly 500 includes a ring gear 510, a sun gear 520 and a plurality of planet gears 530. The plurality of planet gears 530 are all rotatably connected to the first end cover 100. The ring gear 510 is connected to the inner side wall of the inner cavity of the roller body 300. The sun gear 520 is connected to one end of the stirring member 400. The plurality of planet gears 530 are all meshed with the internal teeth of the ring gear 510. The sun gear 520 is simultaneously meshed with the plurality of planet gears 530. The rotating ring gear 510 can drive the plurality of planet gears 530 to rotate synchronously, so that the plurality of planet gears 530 can drive the sun gear 520 to rotate simultaneously, and the rotation direction of the sun gear 520 is opposite to that of the ring gear 510. In the embodiment of the present invention, the axes of the sun gear 520, the ring gear 510 and the plurality of planet gears 530 all coincide with the axis of the roller body 300. As an embodiment of the present invention, the transmission assembly 500 includes three planet gears 530. The three planet gears 530 are all rotatably connected to the first end cover 100, and the first end cover 100 is fixedly connected to the box body of the preheating oven, so that the three planet gears 530 can only rotate around their own axes. The ring gear 510 is connected to the inner side wall of the inner cavity of the roller body 300, that is, the ring gear 510 is arranged in the hot water cavity 310. The rotating roller body 300 can drive the ring gear 510 to rotate around its own axis. Since the internal teeth of the ring gear 510 are simultaneously meshed with the three planet gears 530, the rotating ring gear 510 can drive the three planet gears 530 to rotate synchronously around their own axes. Since the sun gear 520 is simultaneously meshed with the three planet gears 530, the three planet gears 530 can drive the sun gear 520 to rotate around its own axis simultaneously, and the rotation direction of the sun gear 520 is opposite to that of the ring gear 510. Since the sun gear 520 is connected to one end of the stirring member 400, the sun gear 520 can drive the stirring member 400 to rotate, and the rotation direction of the stirring member 400 is opposite to that of the ring gear 510, that is, the rotation direction of the stirring member 400 is opposite to the rotation direction of the roller body 300. In the embodiment of the present invention, the three planet gears 530 are circumferentially arrayed around the axis of the drain port 110.

[0035] As an embodiment of the present invention, the ring gear 510, the planet gears 530 and the sun gear 520 can all be made of plastics, such as high-performance engineering plastics like polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), etc., so that the ring gear 510, the planet gears 530 and the sun gear 520 have excellent corrosion resistance, water resistance and self-lubrication properties and can operate stably in hot water for a long time. The ring gear 510, the planet gears 530 and the sun gear 520 can also be made of copper or stainless steel materials, which will not be elaborated further here.

[0036] Reference Figure 2, the first end cover 100 has a mounting surface, the drain port 110 is provided on the mounting surface, the transmission assembly 500 further includes a plurality of mounting posts 540, one ends of the plurality of mounting posts 540 are all connected to the mounting surface, and a plurality of planetary gears 530 are respectively rotatably connected to the other ends of the plurality of mounting posts 540, so that a region for hot water to flow is left between the plurality of planetary gears 530 and the mounting surface. It can be understood that a drain port 110 is formed on the mounting surface of the first end cover 100, and a plurality of planetary gears 530 are respectively rotatably connected to the mounting surface of the first end cover 100 through a plurality of mounting posts 540. The plurality of mounting posts 540 all play an isolating role, enabling the plurality of planetary gears 530 to be away from the mounting surface of the first end cover 100, so that the sun gear 520 that meshes with the plurality of planetary gears 530 at the same time can be away from the drain port 110 on the mounting surface. At this time, a region for hot water to flow is left between the plurality of planetary gears 530 and the mounting surface to ensure that the hot water in the hot water chamber 310 can flow into this region and smoothly flow into the drain port 110. Assuming that there is no mounting post 540, the sun gear 520 that meshes with the plurality of planetary gears 530 at the same time will block the drain port 110, thereby affecting the discharge of the hot water in the hot water chamber 310.

[0037] Reference Figure 4 and Figure 5, the hot water roller further includes a first support frame 320, the first support frame 320 is connected to the inner side wall of the inner cavity of the roller body 300, a first mounting hole 321 is formed on the first support frame 320, and one end of the stirring member 400 is rotatably connected in the first mounting hole 321. The hot water roller further includes a second support frame 230, the second support frame 230 is provided on the second end cover 200, a second mounting hole 231 is formed on the second support frame 230, and the other end of the stirring member 400 is rotatably connected in the second mounting hole 231. It can be understood that the axes of the first mounting hole 321 on the first support frame 320 and the second mounting hole 231 on the second support frame 230 both coincide with the axis of the roller body 300, and the two ends of the stirring member 400 are respectively rotatably connected in the first mounting hole 321 and the second mounting hole 231, so that the first support frame 320 and the second support frame 230 can provide support for the stirring member 400, enabling the stirring member 400 to rotate smoothly in the hot water cavity 310. As an embodiment of the present invention, the hot water roller further includes a first thrust bearing and a second thrust bearing, the two ends of the stirring member 400 are respectively provided with a first rotating shaft and a second rotating shaft, the first rotating shaft is rotatably connected in the first mounting hole 321 through the first thrust bearing, and the second rotating shaft is rotatably connected in the second mounting hole 231 through the second thrust bearing. The first thrust bearing and the second thrust bearing not only enable the stirring member 400 to rotate smoothly, but also prevent the stirring member 400 from axially swaying during rotation, so it is beneficial to improve the rotation stability of the stirring member 400. Specifically, the first support frame 320 is located on the side of the gear ring 510 away from the first end cover 100, and the sun gear 520 is located on the side of the first support frame 320 close to the first end cover 100.

[0038] Reference Figure 2 and Figure 3 , on the side of the first end cover 100 away from the roller body 300, a drain pipe 120 is provided, the drain pipe 120 is communicated with the drain port 110, on the side of the second end cover 200 away from the roller body 300, a water inlet pipe 220 is provided, and the water inlet pipe 220 is communicated with the water inlet 210. It can be understood that the drain pipe 120 is used to be communicated with the input end of the water heating circulation mechanism, and the water inlet pipe 220 is used to be communicated with the output end of the water heating circulation mechanism to realize the circulating flow of hot water in the hot water cavity 310. In the embodiment of the present invention, the water inlet pipe 220 is communicated with the output end of the water heating circulation mechanism through a rotary seal joint, and the rotary seal joint is a common pipe connection component, which will not be further described here.

[0039] Reference Figure 8The present invention also discloses a preheating oven, comprising a box, a water heating circulation mechanism, a rotary drive mechanism and a plurality of hot water rollers. The plurality of hot water rollers are all rotatably connected in the box, the water heating circulation mechanism and the rotary drive mechanism are both arranged on the box, the rotary drive mechanism is used to drive the plurality of hot water rollers to rotate, and the water heating circulation mechanism is used to circulate hot water in the hot water chambers 310 of the plurality of hot water rollers. In an embodiment of the present invention, the plurality of hot water rollers in the box are all used for film winding, so that the film can move in the box. The water heating circulation mechanism comprises a circulation pump, a water heater, a return pipe and a water outlet pipe, the drain ports 110 of the plurality of hot water rollers are all connected to one end of the return pipe, the other end of the return pipe is connected to the input end of the water heater, the output end of the water heater is connected to the water inlet 210 of the plurality of hot water rollers through the water outlet pipe, and the circulation pump is arranged on the water outlet pipe. The water heater can heat water, so that the hot water flowing out of the plurality of hot water chambers 310 can be heated. The circulation pump can drive the hot water to circulate in the multiple hot water chambers 310, the return pipe, the water heater and the outlet pipe, so as to realize the circulation of the hot water in the multiple hot water chambers 310. The water heating circulation mechanism is a common setting in the field of film preheating ovens, and will not be further described here. The preheating oven can make the film fully absorb heat, ensure the surface quality of the film, and then ensure the coating quality of the subsequent coating device.

[0040] In an embodiment of the present invention, the rotary drive mechanism includes a plurality of motors, which are all arranged on the box body, and the output ends of the plurality of motors are respectively connected to the second end covers 200 of the plurality of hot water rollers, so that the plurality of motors can respectively drive the roller bodies 300 and the second end covers 200 of the plurality of hot water rollers to rotate. The rotary drive mechanism is a common setting in the field of film preheating boxes, and will not be further described here. In an embodiment of the present invention, the preheating oven also includes a hot air circulation mechanism, which is arranged on the box body, and the hot air circulation mechanism is used to circulate the hot air in the box body. The hot air circulation mechanism can circulate the hot air in the box body, so that the air in the box body can be kept at a suitable temperature, and the hot air can act on the film to achieve the preheating effect of the film. The hot air circulation mechanism includes a return air duct, an air inlet duct, an air supply pump, a fresh air duct, an air filter and an air heater. The hot air circulation mechanism is a common setting in the field of film preheating boxes, and will not be further described here. In an embodiment of the present invention, the box body is provided with a thermal insulation layer, and a thermal insulation medium is provided in the thermal insulation layer. It is understandable that the heat preservation layer is arranged inside the box, and the heat preservation layer can reduce the heat loss in the box, and ensure that the temperature of the inner cavity of the box can be stably maintained at a set level. The heat preservation medium can be a heat-insulating material such as polymer foam.

[0041] The present invention also discloses a double-unwinding and double-winding dot coating production line, which includes two continuous dot coating devices, one of the continuous dot coating devices is arranged above the other continuous dot coating device. Both of the continuous dot coating devices include an automatic unwinding device, a dot coating device, a pneumatic floating oven, a deviation rectifying device, an automatic winding device and a preheating oven. The automatic unwinding device, the preheating oven, the dot coating device, the pneumatic floating oven, the deviation rectifying device and the automatic winding device are arranged in sequence along the conveying path of the film. In the embodiment of the present invention, the double-unwinding and double-winding dot coating production line includes two continuous dot coating devices that can independently perform dot coating processing on the film, so the dot coating efficiency of the film can be significantly improved. Each continuous dot coating device includes an automatic unwinding device, a preheating oven, a dot coating device, a pneumatic floating oven, a deviation rectifying device and an automatic winding device that are arranged from back to front. The preheating oven can enable the film to fully absorb heat, ensure the surface quality of the film, and further ensure the dot coating quality of the subsequent dot coating device, so it is beneficial to improve the quality of the film products processed by the continuous dot coating device. The automatic unwinding device, the dot coating device, the pneumatic floating oven, the deviation rectifying device and the automatic winding device are all common devices in the dot coating technical field and will not be further described here.

[0042] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0043] Certainly, the present invention is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. Hot water roller, characterized in that, Comprising: A first end cover provided with a drain port; A second end cover provided with a water inlet; A roller body, one end of which is rotatably and sealingly connected to the first end cover, and the other end of which is connected to the second end cover. The roller body is used for winding a film. A hot water cavity is formed by enclosing the inner cavity of the roller body, the first end cover and the second end cover. The hot water cavity is communicated with the drain port and the water inlet, and the hot water cavity is used for the flow of hot water; A stirring member disposed in the hot water cavity, and the axis of the stirring member coincides with the axis of the roller body; A transmission assembly disposed in the hot water cavity. One end of the roller body is drivingly connected to the stirring member through the transmission assembly. The rotating roller body can drive the stirring member to rotate in the opposite direction so that the stirring member stirs the hot water in the hot water cavity.

2. The hot water roller according to claim 1, characterized in that: The stirring member is a spiral blade. A spiral flow channel for the flow of hot water is formed between the spiral blade and the inner side wall of the hot water cavity. The rotating roller body can drive the spiral blade to rotate in the opposite direction so that the spiral blade stirs the hot water in the hot water cavity and makes the spiral blade push the hot water in the spiral flow channel to flow towards the direction of the drain port.

3. The hot water roller according to claim 1, characterized in that: The transmission assembly includes a ring gear, a sun gear and a plurality of planetary gears. The plurality of planetary gears are all rotatably connected to the first end cover. The ring gear is connected to the inner side wall of the inner cavity of the roller body. The sun gear is connected to one end of the stirring member. The plurality of planetary gears are all meshed with the internal teeth of the ring gear. The sun gear is simultaneously meshed with the plurality of planetary gears. The rotating ring gear can drive the plurality of planetary gears to rotate synchronously so that the plurality of planetary gears simultaneously drive the sun gear to rotate, and the rotation direction of the sun gear is opposite to that of the ring gear.

4. The hot water roller according to claim 1, characterized in that: It further includes a first support frame, which is connected to the inner side wall of the inner cavity of the roller body. A first mounting hole is formed on the first support frame, and one end of the stirring member is rotatably connected in the first mounting hole.

5. The hot water roller according to claim 1, wherein: It further includes a second support frame, which is disposed on the second end cover. A second mounting hole is formed on the second support frame, and the other end of the stirring member is rotatably connected in the second mounting hole.

6. The hot water roll according to claim 1, wherein: On the side of the first end cover away from the roller body, a drain pipe is provided, and the drain pipe is communicated with the drain port. On the side of the second end cover away from the roller body, a water inlet pipe is provided, and the water inlet pipe is communicated with the water inlet.

7. Preheating oven, characterized in that, Comprising a box body, a water heating and circulating mechanism, a rotation driving mechanism and a plurality of hot water rollers as described in any one of claims 1 to 6. The plurality of hot water rollers are all rotatably connected in the box body. The water heating and circulating mechanism and the rotation driving mechanism are both disposed on the box body. The rotation driving mechanism is used to drive the plurality of hot water rollers to rotate, and the water heating and circulating mechanism is used to make hot water circulate in the hot water cavities of the plurality of hot water rollers.

8. The preheating oven according to claim 7, wherein: It further includes a hot air circulating mechanism, which is disposed on the box body, and the hot air circulating mechanism is used to make hot air circulate in the box body.

9. The preheating oven according to claim 8, characterized in that: The box body is provided with a heat insulation layer, and a heat insulation medium is provided in the heat insulation layer.

10. Double - application and double - recovery dot - coating production line, characterized in that, It includes two continuous dot coating devices, with one of the continuous dot coating devices disposed above the other. Both of the continuous dot coating devices include an automatic unwind device, a dot coating device, a pneumatic floating oven, a deviation rectifying device, an automatic rewind device, and a preheating oven as described in any one of claims 7 to 9. The automatic unwind device, the preheating oven, the dot coating device, the pneumatic floating oven, the deviation rectifying device, and the automatic rewind device are arranged in sequence along the conveying path of the film.

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