PEVA film preparation device

Abstract

The invention discloses a PEVA film preparation device, and belongs to the technical field of film production device.The PEVA film preparation device comprises a mounting frame, a corona roller is rotationally mounted on the mounting frame, an electrode and a corona cover are arranged above the corona roller, the corona cover is in an arc shape and located outside the electrode, a scraping plate and a collecting tank are arranged in the corona cover, and a support is rotationally mounted on the mounting frame; the scraping plate and the collecting tank are both installed on the support, and when the support is driven to swing, the scraping plate is attached to the inner wall of the corona cover to move and guides liquid drops on the inner wall of the corona cover into the collecting tank; according to the thin film preparation device, the support drives the scraper and the collecting tank to swing on the inner side of the corona cover, one side of the scraper makes contact with the inner wall of the corona cover, the other side of the scraper is right opposite to the opening of the collecting tank, and in the process that the support drives the scraper and the collecting tank to swing, the scraper can guide waste liquid on the inner wall of the corona cover into the collecting tank; the waste liquid in the corona cover is prevented from dripping on the surface of the film, so that the production quality of the film is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of film production devices, and in particular discloses a PEVA film preparation device. Background Art

[0002] With the development of society, plastic flexible packaging has been widely used in various fields of commodity packaging. Non-polar film materials such as PEVA and polypropylene are commonly used for flexible packaging. PEVA, namely polyethylene-vinyl acetate, is a mixture of PE and EVA. It has good softness and a little elasticity. Due to its low surface free energy, it cannot make adhesives infiltrate. It must be surface treated to improve its surface free energy. Commonly used treatment methods include corona method, chemical corrosion method and flame burning method. The corona method is widely used due to its advantages such as good treatment effect, high efficiency and high safety. When using the corona method for treatment, it can be directly carried out on the production line of PEVA film, that is, hot film treatment. At this time, since the polymer molecules have not yet completed crystallization, the treatment effect is strong.

[0003] For example, the patent with announcement number CN115366397B, with announcement date of 2024-08-09, discloses a corona machine for film surface treatment, including a machine platform, a corona roller rotatably mounted on the machine platform, a corona cover covering the corona roller, and an electrode arranged in the corona cover, wherein an air hole is opened on the top of the corona cover, an air nozzle arranged in the direction of the air hole is arranged at the bottom of the corona cover, and an air supply component for supplying air to the air nozzle is arranged on the machine platform.

[0004] During the corona treatment process, due to the high voltage applied between the corona roller and the electrode, the generated electrons collide and activate the molecules in the air between the two electrodes, and the generated ozone and nitric oxide substances, due to their hydrophilicity, will combine with the water molecules in the air to produce waste liquid containing nitrite and nitrate components, and increase with the increase of air humidity. If the generated waste liquid cannot be cleaned in time, it will remain in the discharge pipe or the electrode cover, and may drip onto the surface of the film, causing the local wetting tension of the film to decrease, the adhesion to be weak, etc., resulting in product quality problems; corona mainly relies on the plasma generated by air ionization, such as electrons, oxygen ions and ozone, which can react chemically with the surface of the material to form more polar groups, such as hydroxyl (-OH) and carbonyl (C=O), which increase the polarity of the material surface, thereby increasing the surface energy and dyne value, and the above-mentioned corona device, by filling the power cover with inert gas to reduce the generation of substances such as ozone and nitric oxide under high pressure environment, this method will cause the proportion of air in the corona cover to decrease, thereby reducing the corona effect. Summary of the invention

[0005] The purpose of the present invention is to provide a PEVA film preparation device.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A PEVA film preparation device comprises a mounting frame, on which a corona roller is rotatably mounted, an electrode and a corona cover are arranged above the corona roller, the corona cover is arc-shaped and is located outside the electrode, a scraper and a collecting trough are arranged inside the corona cover, a bracket is rotatably mounted on the mounting frame, the scraper and the collecting trough are both mounted on the bracket, and when the bracket is driven to swing, the scraper moves in contact with the inner wall of the corona cover and guides droplets on the inner wall of the corona cover to the collecting trough.

[0008] In the above-mentioned film preparation device, a sealing cover is fixedly connected to the upper part of the corona cover, and air holes are opened on the corona cover at positions corresponding to the sealing cover, and the air holes connect the internal spaces of the corona cover and the sealing cover.

[0009] The above-mentioned thin film preparation device, the bracket includes two support rods arranged in parallel, one end of the two support rods are connected by a connecting rod, and the other ends of the two support rods are rotatably connected to the mounting frame, the collecting trough is rotatably connected to the connecting rod, and the notch of the collecting trough is always facing upwards during the swing of the bracket, the scraper is installed on the connecting rod, and the length of the scraper is less than the length of the notch of the collecting trough.

[0010] In the above-mentioned film preparation device, a counterweight block is fixedly connected to the outer wall of the collecting tank.

[0011] In the above-mentioned film preparation device, both sides of the corona cover are bent inward to form a liquid storage tank, and a limiting member is arranged in the corona cover. When the bracket is driven to swing until the collecting tank is above the liquid storage tank, the limiting member drives the collecting tank to rotate.

[0012] In the above-mentioned film preparation device, the limiting member includes a baffle fixedly connected to the inner wall of the corona cover, and a lever is fixedly connected to the end surface of the collecting tank parallel to the axial direction thereof, and the baffle cooperates with the corresponding lever.

[0013] In the above-mentioned film preparation device, the positions on the corona cover corresponding to the liquid storage tanks are all connected with drainage pipes.

[0014] In the above-mentioned film preparation device, the corona shield is a part of an ellipse, the scraper is rotatably connected to the connecting rod, and a torsion spring is provided on the connecting rod to maintain the relative angle between the scraper and the connecting rod. When the torsion spring is in a natural state, the scraper surface is in a vertical state.

[0015] In the above-mentioned film preparation device, a vibration component is arranged in the corona cover. When the collecting tank is blocked by the baffle and rotates, the collecting tank is driven by the vibration component to vibrate.

[0016] In the above-mentioned film preparation device, a first gear is fixedly connected to a support rod, and the first gear is an incomplete gear. A driving motor is fixedly connected to the mounting frame, and a second gear is installed at the output end of the driving motor, and the second gear is meshed with the first gear.

[0017] In the above technical scheme, the film preparation device provided by the present invention drives the scraper and the collecting trough to swing inside the corona hood through the bracket, and makes one side of the scraper contact with the inner wall of the corona hood, and the other side faces the opening of the collecting trough. In the process of the scraper and the collecting trough driven by the bracket to swing, the scraper can guide the waste liquid on the inner wall of the corona hood to the collecting trough to avoid the waste liquid in the corona hood from dripping onto the surface of the film, thereby ensuring the production quality of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A front view provided for an embodiment of the present invention;

[0020] Figure 2 A stereogram provided for an embodiment of the present invention;

[0021] Figure 3 A cross-sectional view provided for an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of a scraper provided in an embodiment of the present invention in the middle of a corona shield;

[0023] Figure 5 A schematic diagram of the state of the scraper provided in the embodiment of the present invention when it is located on one side of the corona shield;

[0024] Figure 6 A schematic diagram of the installation state of the scraper and the collecting trough provided in an embodiment of the present invention;

[0025] Figure 7 The embodiment of the present invention provides Figure 5 The enlarged schematic diagram at A in the middle;

[0026] Figure 8 The embodiment of the present invention provides Figure 6 The enlarged schematic diagram of point B in the middle;

[0027] Fig. 9 The embodiment of the present invention provides Figure 6 Enlarged schematic diagram at point C in the middle.

[0028] Description of reference numerals:

[0029] 1. Mounting frame; 11. Corona roller; 12. Electrode; 2. Corona cover; 21. Sealing cover; 22. Air hole; 23. Liquid storage tank; 24. Baffle; 25. Drain pipe; 26. Protrusion; 3. Scraper; 4. Collecting tank; 41. Counterweight; 42. Push rod; 5. Bracket; 51. Support rod; 511. First gear; 52. Connecting rod; 6. Drive motor; 61. Second gear. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] In the description of the present invention, unless otherwise specified, "multiple" means two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1-Figure 9 As shown, a PEVA film preparation device provided by an embodiment of the present invention includes a mounting frame 1, on which a corona roller 11 is rotatably mounted, an electrode 12 and a corona cover 2 are arranged above the corona roller 11, the corona cover 2 is arc-shaped and is located outside the electrode 12, a scraper 3 and a collecting trough 4 are arranged in the corona cover 2, a bracket 5 is rotatably mounted on the mounting frame 1, the scraper 3 and the collecting trough 4 are both mounted on the bracket 5, and when the bracket 5 is driven to swing, the scraper 3 moves in contact with the inner wall of the corona cover 2 and guides the droplets on the inner wall of the corona cover 2 to the collecting trough 4.

[0033] Specifically, the preparation device further includes an extruder, a cooling roller and a winding roller, and the mounting frame 1 is arranged between the cooling roller and the winding roller. Figure 1 In the figure, tension rollers are also arranged on both sides of the mounting frame 1, and a corona roller 11 and an electrode 12 are arranged on the mounting frame 1, wherein the corona roller 11 is rotatably connected to the mounting frame 1, and a motor (not shown in the figure) for driving the corona roller 11 to rotate is arranged on the mounting frame 1. Figure 1In the embodiment, the tensioning rollers arranged on the left and right sides of the mounting frame 1 are in contact with the upper surface of the film, and the corona roller 11 is in contact with the lower surface of the film, so that the film at the corona roller 11 can be tensioned, thereby improving the corona effect, and the electrode 12 is fixedly connected to the mounting frame 1, and the electrode 12 is arranged directly above the corona roller 11. In addition, a corona cover 2 is installed on the mounting frame 1 outside the electrode 12, as shown in FIG. Figures 3 to 5 As shown, the cross-section of the corona hood 2 is arc-shaped, and the corona hood 2 is fixedly connected to the mounting frame 1. The raw materials for producing the PEVA film are extruded into a film and cooled by a cooling roller, and then pass through the corona roller 11 and the electrode 12 to perform corona treatment, and finally are wound up by a winding roller; different from the prior art, a scraper 3 and a collecting trough 4 are also provided in the corona hood 2. In this embodiment, the corona hood 2 is arc-shaped, and a bracket 5 is rotatably mounted on the mounting frame 1, and the scraper 3 and the collecting trough 4 are both long strips, and the scraper 3 and the collecting trough 4 are both fixedly connected to the bracket 5, wherein the scraper 3 is a rectangular plate-like structure, one side of which is in contact with the inner wall of the corona hood 2, and the other side is opposite to the opening of the collecting trough 4. Preferably, the other side of the scraper 3 extends into the collecting trough 4, and the collecting trough 4 is a semi-cylinder with a semi-cylindrical accommodating cavity opened therein, such as Figure 6 and Figure 8 As shown, the mounting frame 1 is also provided with a driving member such as another motor for driving the bracket 5 to swing. During the corona process, the motor drives the bracket 5 to swing in the corona cover 2. During this process, the scraper 3 scrapes off the waste liquid condensed on the inner wall of the corona cover 2 and guides it to the collecting tank 4 to prevent the waste liquid from dripping onto the surface of the film and affecting the corona effect. Since the waste liquid is guided to the collecting tank 4 by the scraper 3, it is necessary to manually discharge the waste liquid in the collecting tank 4 regularly during the actual production process, or connect a discharge pipe to the collecting tank 4 to discharge the waste liquid. This is the prior art and can be directly applied without further elaboration. The lengths of the corona cover 2, the scraper 3 and the collecting tank 4 are all greater than the length of the corona roller 11 to ensure that the waste liquid in the area where the inner wall of the corona cover 2 is above the film is fully cleaned. In addition, the size of the bracket 5 along the length direction of the corona cover 2 is greater than the length of the electrode 12, so that the bracket 5 can be installed on the outside of the two ends of the electrode 12, and the scraper 3 and the collecting tank 4 pass over the electrode 12 during the swinging of the bracket 5. Figure 4 As shown, the swinging trajectory of the scraper 3 and the collecting trough 4 is prevented from interfering with the setting of the electrode 12.

[0034] The film preparation device proposed in the present invention drives the scraper 3 and the collecting trough 4 to swing inside the corona cover 2 through the bracket 5, and makes one side of the scraper 3 contact the inner wall of the corona cover 2, and the other side faces the opening of the collecting trough 4. During the process of the scraper 3 and the collecting trough 4 being driven by the bracket 5 to swing, the scraper 3 can guide the waste liquid on the inner wall of the corona cover 2 to the collecting trough 4, so as to prevent the waste liquid in the corona cover 2 from dripping onto the surface of the film, thereby ensuring the production quality of the film.

[0035] Furthermore, a sealing cover 21 is fixedly connected to the upper part of the corona cover 2 , and air holes 22 are provided on the corona cover 2 at positions corresponding to the sealing cover 21 , and the air holes 22 connect the internal spaces of the corona cover 2 and the sealing cover 21 .

[0036] Specifically, during the corona process, air is ionized to produce electrons, oxygen ions and ozone. As the corona process proceeds, oxygen ions and ozone will be gradually consumed. In order to prevent the concentration of nitric oxide from being too high and combining with water molecules to produce waste liquid containing nitrite and nitrate components, resulting in excessive production of waste liquid, in the actual production process, the gas in the corona cover 2 will be partially discharged through the exhaust device so that the air can enter the corona cover 2 and be ionized. In this embodiment, a sealing cover 21 is fixedly connected to the corona cover 2, and the opening of the sealing cover 21 is connected to the corona cover 2. The outer wall corresponds to the corona cover 2, so that the corona cover 2 can cover the opening of the sealing cover 21. A number of air holes 22 are opened on the corona cover 2 at positions corresponding to the openings of the sealing cover 21. The air holes 22 connect the space inside the corona cover 2 with the space inside the sealing cover 21. In addition, an air pump (not shown in the figure) is also provided on the corona cover 2. The gas in the sealing cover 21 is extracted by the air pump, so that the ozone and nitric oxide generated by the corona process are partially discharged. At the same time, the air will enter the interior of the corona cover 2 through the opening at the bottom of the corona cover 2 and be ionized, so as to facilitate the continuous operation of the corona.

[0037] Furthermore, the bracket 5 includes two parallel support rods 51, one ends of the two support rods 51 are connected by a connecting rod 52, and the other ends of the two support rods 51 are rotatably connected to the mounting frame 1, the collecting trough 4 is rotatably connected to the connecting rod 52, and the notch of the collecting trough 4 is always facing upwards during the swinging of the bracket 5, the scraper 3 is installed on the connecting rod 52, and the length of the scraper 3 is less than the length of the notch of the collecting trough 4.

[0038] Preferably, a counterweight 41 is fixedly connected to the outer wall of the collecting tank 4 .

[0039] Specifically, in the above embodiment, the collecting trough 4 is directly fixed to the bracket 5, and the bracket 5 swings about a fixed axis, which will cause the notch of the collecting trough 4 to deflect during the swinging of the bracket 5, that is, the notch of the collecting trough 4 cannot be kept always facing upwards, and in this process, the inclination angle of the scraper 3 relative to the vertical plane will change during the swinging of the bracket 5. Once the inclination angle of the scraper 3 is too large, its end will protrude from the opening of the collecting trough 4 (the side of the scraper 3 in contact with the inner wall of the corona cover 2 is located obliquely above the opening of the collecting trough 4). At this time, the waste liquid on the inner wall of the corona cover 2 will not be guided into the collecting trough 4 by the scraper 3, but will drip downward under the action of gravity. However, due to the limitation of the space inside the corona cover 2, the width of the opening of the collecting trough 4 is limited, which will cause part of the waste liquid to drip onto the film. In this embodiment, the bracket 5 includes two parallel support rods 51, one end of the two support rods 51 is connected by a connecting rod 52, and the other ends of the two support rods 51 are rotatably connected to the mounting frame 1, such as Figure 6 and Figure 8 As shown, the collecting trough 4 is rotatably connected to the connecting rod 52, and the rotation axis of the collecting trough 4 coincides with the central axis of the connecting rod 52. In addition, in this embodiment, the scraper 3 is fixedly mounted on the connecting rod 52, and the length of the scraper 3 is less than the length of the notch of the collecting trough 4. With such an arrangement, during the swinging of the collecting trough 4 with the bracket 5, the collecting trough 4 is affected by gravity, and its opening can always face upward to receive the waste liquid guided by the scraper 3 and the freely dripping waste liquid. Preferably, a counterweight 41 is fixedly connected to the outer wall of the collecting trough 4, and the counterweight 41 is arranged on the side wall of the outer wall of the collecting trough 4 away from the opening. With such an arrangement, the overall rotational inertia of the collecting trough 4 is increased, thereby reducing the swing amplitude of the collecting trough 4, and ensuring that the collecting trough 4 can be stably in a state with the notch facing upward during the swinging of the bracket 5.

[0040] In another embodiment of the present invention, both sides of the corona cover 2 are bent inward to form a liquid storage groove 23, and a limiting member is provided in the corona cover 2. When the bracket 5 is driven to swing until the collecting groove 4 is above the liquid storage groove 23, the limiting member drives the collecting groove 4 to rotate.

[0041] Furthermore, the limiting member includes a baffle 24 fixed to the inner wall of the corona cover 2 , and a lever 42 is fixed to the end surface of the collecting tank 4 parallel to the axial direction thereof, and the baffle 24 cooperates with the corresponding lever 42 .

[0042] Furthermore, the positions on the corona cover 2 corresponding to the liquid storage tanks 23 are all connected with drainage pipes 25 .

[0043] Specifically, in the above embodiment, the method of connecting the pipe to the collection tank 4 is used to discharge the waste liquid in the collection tank 4. Since the collection tank 4 is rotatably connected to the connecting rod 52, and in the process of the bracket 5 driving the collection tank 4 to swing, the pipe has a certain pulling force on the collection tank 4. The pulling force applied by the pipe to the collection tank 4 will affect the rotation of the collection tank 4, thereby causing the collection tank 4 to be unable to always keep its opening upward under the action of gravity; in this embodiment, both sides of the corona cover 2 are bent inward to form a liquid storage tank 23, such as Figures 3 to 5 As shown, the inner wall of the corona cover 2 is provided with a limiting member, and optionally, the limiting member is a baffle 24 fixed to the inner wall of the corona cover 2, and each baffle 24 is respectively fixed to the inner wall at both ends of the corona cover 2, as shown in FIG. Figures 3 to 5 As shown, the baffle 24 is located obliquely above the corresponding liquid storage tank 23, and the end surface of the collecting tank 4 is Figure 4 The front end face and the rear end face in the view are fixedly connected with a lever 42, the lever 42 and the baffle 24 are arranged in a one-to-one correspondence, and the lever 42 and the corresponding baffle 24 cooperate with each other, and the lever 42 is symmetrically arranged on both sides of the two end faces of the collecting tank 4, that is, two groups of levers 42 are arranged on the same end face of the collecting tank 4, and the two groups of levers 42 are symmetrically arranged about the end faces where they are located, and each lever 42 is arranged along the length direction of the collecting tank 4; with such an arrangement, when the collecting tank 4 swings with the bracket 5, after the lever 42 contacts with its corresponding baffle 24, it is blocked by the baffle 24, and the side of the collecting tank 4 corresponding to the lever 42 cannot continue to swing with the bracket 5. As the bracket 5 continues to swing, the collecting tank 4 will rotate around its rotation axis, that is, the central axis of the connecting rod 52, under the obstruction of the baffle 24, so that the waste liquid in the collecting tank 4 is poured into the liquid storage tank 23. Figures 3 to 5 In the figure, when the collecting tank 4 swings with the bracket 5 to the upper side of the liquid storage tank 23 on the left side of the corona cover 2, the baffle 24 on the inner wall on the left side of the corona cover 2 blocks the collecting tank 4 (the collecting tank 4 opens upward) from the upper side of the corona cover 2. Figure 3 When the collecting tank 4 swings with the bracket 5 to the upper side of the liquid storage tank 23 on the right side of the corona cover 2, the baffle 24 on the right inner wall of the corona cover 2 blocks the collecting tank 4 from Figure 3 The lever 42 is on the left side of the view; obviously, since the corona shield 2 is fixedly mounted on the mounting frame 1, the drain pipe 25 can be connected to the corona shield 2, and the water inlet end of the drain pipe 25 corresponds to the lower part of the liquid storage tank 23 on the corona shield 2, so that the waste liquid in the liquid storage tank 23 can be discharged outward for subsequent treatment.

[0044] In another embodiment of the present invention, the corona shield 2 is a portion of an ellipse, the scraper 3 is rotatably connected to the connecting rod 52, and a torsion spring is provided on the connecting rod 52 for maintaining the relative angle between the scraper 3 and the connecting rod 52. When the torsion spring is in a natural state, the surface of the scraper 3 is in a vertical state.

[0045] Specifically, in the above embodiment, since the scraper 3 is fixedly mounted on the bracket 5, the angle between the scraper 3 and the inner wall of the inner wall of the corona cover 2 on the side of the waste liquid to be removed is always greater than or equal to ninety degrees during the swinging of the scraper 3 with the bracket 5. Figures 3 to 5 As shown, when the scraper 3 is moved along with the bracket 5 by Figure 4 When the state swings to the left side of the corona cover 2, the side of the inner wall of the corona cover 2 where the waste liquid is to be removed is the left side of the scraper 3, and when the scraper 3 is moved along with the bracket 5 by Figure 3 When the state is swung to the right side of the corona cover 2, the side of the inner wall of the corona cover 2 where the waste liquid is to be removed is the right side of the scraper 3. When the scraper 3 swings with the bracket 5 to a position closer to the two sides of the corona cover 2, the angle between it and the direction of gravity will be larger. Once the angle between the scraper 3 and the direction of gravity is too large, such as exceeding 30°, its diversion effect will be reduced. At this time, the waste liquid will not be able to be guided to the collecting trough 4 by the scraper 3, but will naturally drip under the action of gravity, and part of the waste liquid will drip onto the surface of the film; in this embodiment, the corona cover 2 is a part of an ellipse, and the semi-major axis of the ellipse is in the horizontal direction, and the semi-minor axis is in the vertical direction. In addition, the scraper 3 is rotatably connected to the connecting rod 52 of the bracket 5, and the connecting rod 52 is provided with a torsion spring (not shown in the figure) for maintaining the relative angle between the scraper 3 and the connecting rod 52. Figure 3 or Figure 4 When the torsion spring is in the position shown in the figure, it is in a natural state, and the surface of the scraper 3 is in a vertical state;

[0046] In the process of cleaning the waste liquid on the inner wall of the corona cover 2, when the scraper 3 moves from the middle of the corona cover 2 to one side under the drive of the bracket 5, since the scraper 3 moves from the semi-major axis to the semi-minor axis of the ellipse along the inner wall of the ellipse, in this process, the scraper 3 is limited by the size of the inner wall of the corona cover 2 and will gradually tilt, so that the scraper 3 rotates with the central axis of the connecting rod 52 to perform adaptive adjustment, and the angle between the scraper 3 and the gravity direction is controlled within a certain range, such as plus or minus 30°, so as to keep the scraper 3 at the best diversion angle to prevent the waste liquid from naturally dripping onto the film surface. On the other hand, the scraper 3 is moved by the bracket 5. Figure 4 When swinging to the left and to the right in the view, the contact position with the inner wall of the corona cover 2 is different. When swinging to the left, the left side portion of the upper end of the scraper 3 contacts the inner wall of the corona cover 2, and when swinging to the right, the right side portion of the upper end of the scraper 3 contacts the inner wall of the corona cover 2, which slows down the wear of the scraper 3 to a certain extent, thereby extending the service life of the scraper 3.

[0047] Furthermore, a vibration component is provided in the corona cover 2. When the collecting tank 4 is blocked by the baffle 24 and rotates, the collecting tank 4 is driven by the vibration component to vibrate.

[0048] Optionally, the vibration component is a plurality of continuously arranged protrusions 26 provided on the inner wall of the corona shield 2 , the protrusions 26 are provided along the length direction of the corona shield 2 , and the cross section of the protrusions 26 is triangular.

[0049] Specifically, in the above embodiment, when the collecting tank 4 swings with the bracket 5 to the top of the liquid storage tank 23, as the bracket 5 continues to swing, the collecting tank 4 will rotate around the central axis of the connecting rod 52 under the restriction of the baffle 24, thereby pouring the waste liquid in the collecting tank 4 into the liquid storage tank 23. During this process, some droplets will remain at the edge of the collecting tank 4, and when the collecting tank 4 swings in the opposite direction with the bracket 5, the droplets on the edge of the collecting tank 4 may slide onto the film under the action of gravity; in this embodiment, a vibration component is provided in the corona cover 2, when the collecting tank 4 rotates and pours the waste liquid into the liquid storage tank 23, the vibration component will drive the collecting tank 4 to vibrate, thereby vibrating the droplets remaining on the edge of the collecting tank 4 into the liquid storage tank 23, optionally, the vibration component is a plurality of protrusions 26 arranged in the corona cover 2, the plurality of protrusions 26 are arranged along the length direction of the corona cover 2, and the cross-section of each protrusion 26 is triangular, preferably, and the plurality of protrusions 26 are arranged continuously, such as Figure 7 As shown in the figure, when the scraper 3 rotates with the bracket 5 to contact the protrusion 26, it is blocked by the protrusion 26 and further deflected. After the scraper 3 passes over the protrusion 26, it will quickly recover a certain angle under the torsion of the torsion spring, that is, rotate to the next protrusion 26. The vibration generated by the scraper 3 hitting the next protrusion 26 is transmitted to the collecting tank 4 through the connecting rod 52, so that the liquid on the edge of the collecting tank 4 is vibrated and dropped into the liquid storage tank 23. In order to further improve the vibration effect on the collecting tank 4, the present embodiment is different from the above embodiment. In the embodiment described above, the scraper 3 is fixedly connected to the connecting rod 52, and the two ends of the connecting rod 52 are rotatably connected to the corresponding support rods 51 respectively. The torsion springs are arranged at the connecting positions between the two ends of the connecting rod 52 and the support rod 51. Such arrangement ensures that both the scraper 3 and the collecting trough 4 can rotate by themselves to adjust the angle. At the same time, the vibration generated by the scraper 3 hitting the protrusion 26 can be directly transmitted to the connecting rod 52, and then transmitted from the connecting rod 52 to the collecting trough 4, so as to avoid vibration loss caused by the rotational connection between the scraper 3 and the connecting rod 52.

[0050] In another embodiment of the present invention, a first gear 511 is fixedly connected to the support rod 51, and the first gear 511 is an incomplete gear. A driving motor 6 is fixedly connected to the mounting frame 1, and a second gear 61 is installed at the output end of the driving motor 6, and the second gear 61 is meshed with the first gear 511.

[0051] Specifically, in the specific implementation process, in order to avoid the motor control circuit failure resulting in the motor being unable to reverse in time at the end of the travel of the bracket 5, the mounting frame 1 cannot be stopped in time at the end of its travel and swings in the opposite direction, causing the support rod 51 to hit the corona cover 2; in this embodiment, a set of the support rods 51 are fixedly connected to one end of the mounting frame 1 connected to the first gear 511, and the first gear 511 is a complete gear, such as Fig. 9 As shown in the figure, the first gear 511 is half of the gear, and a driving motor 6 is fixedly installed on the mounting frame 1, and the output end of the driving motor 6 is fixedly connected to the second gear 61, and the second gear 61 and the first gear 511 are meshed with each other. The arrangement enables the second gear 61 to drive the first gear 511 to rotate a certain angle, that is, the angle that the bracket 5 can swing. If the second gear 61 does not change the rotation direction, the first gear 511 cannot be driven to continue to rotate. Only when the second gear 61 is reversed can the first gear 511 be driven to rotate in the opposite direction, thereby causing the bracket 5 to swing in the opposite direction, thereby achieving protection for the support rod 51 and the corona cover 2.

[0052] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A PEVA film preparation device, comprising a mounting frame, on which a corona roller is rotatably mounted, an electrode and a corona shield are arranged above the corona roller, the corona shield is arc-shaped and is located outside the electrode, characterized in that: A scraper and a collecting trough are arranged in the corona hood, a bracket is rotatably mounted on the mounting frame, and the scraper and the collecting trough are both mounted on the bracket. When the bracket is driven to swing, the scraper moves along the inner wall of the corona hood and guides the droplets on the inner wall of the corona hood to the collecting trough.

2. A PEVA film preparation device according to claim 1, characterized in that: The upper part of the corona cover is fixedly connected with a sealing cover, and air holes are provided on the corona cover at positions corresponding to the sealing cover, and the air holes connect the internal spaces of the corona cover and the sealing cover.

3. A PEVA film preparation device according to claim 1 or 2, characterized in that: The bracket includes two support rods arranged in parallel, one ends of the two support rods are connected by a connecting rod, and the other ends of the two support rods are rotatably connected to the mounting frame, the collecting trough is rotatably connected to the connecting rod, and the notch of the collecting trough is always facing upwards during the swing of the bracket, the scraper is installed on the connecting rod, and the length of the scraper is less than the length of the notch of the collecting trough.

4. A PEVA film preparation device according to claim 3, characterized in that: A counterweight block is fixedly connected to the outer wall of the collecting tank.

5. A PEVA film preparation device according to claim 3, characterized in that: Both sides of the corona cover are bent inward to form a liquid storage tank, and a limiting member is arranged in the corona cover. When the bracket is driven to swing until the collecting tank is above the liquid storage tank, the limiting member drives the collecting tank to rotate.

6. A PEVA film preparation device according to claim 5, characterized in that: The limiting member comprises a baffle fixedly connected to the inner wall of the corona cover, a lever is fixedly connected to the end surface of the collecting groove parallel to the axial direction thereof, and the baffle matches with the corresponding lever.

7. A PEVA film preparation device according to claim 5, characterized in that: The positions on the corona cover corresponding to the liquid storage tanks are all connected with drainage pipes.

8. A PEVA film preparation device according to claim 6, characterized in that: The corona shield is a part of an ellipse. The scraper is rotatably connected to a connecting rod. A torsion spring is provided on the connecting rod to maintain the relative angle between the scraper and the connecting rod. When the torsion spring is in a natural state, the surface of the scraper is in a vertical state.

9. A PEVA film preparation device according to claim 8, characterized in that: A vibration component is arranged in the corona cover. When the collecting tank is blocked by the baffle plate and rotates, the collecting tank is driven by the vibration component to vibrate.

10. A PEVA film preparation device according to claim 3, characterized in that: A first gear is fixedly connected to the support rod, and the first gear is an incomplete gear. A driving motor is fixedly connected to the mounting frame, and a second gear is installed at the output end of the driving motor, and the second gear is meshed with the first gear.

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