PVC coining film leveling device

Abstract

The utility model relates to a PVC coining film leveling device. The device comprises a rack, a transmission system, a lead-in roller, an electromagnetic heating roller, two shaping rollers and a wind-up roller, all the rollers are horizontally and rotatably arranged relative to the rack, each shaping roller comprises a mandrel, an outer cylinder and spokes connecting the mandrel and the outer cylinder, the space between the outer cylinder and the mandrel is divided into a plurality of heat dissipation cavities by the spokes, the two ends of each heat dissipation cavity are communicated, and the two ends of each heat dissipation cavity are communicated. The inner side wall of the outer cylinder is further provided with a plurality of cooling fins extending towards the cooling cavity. The machine frame comprises two side plates which are vertically fixed in parallel, the two ends of the two shaping rollers are installed on the two side plates respectively, a negative pressure fan is arranged at the ends, close to the two shaping rollers, of the side plates, and the suction end of the negative pressure fan right faces the ends of the two shaping rollers. The film is heated through the electromagnetic heating roller to be softened, internal stress of the film is eliminated, then the film is leveled, cooled and shaped through the two shaping rollers, the whole structure is simple, cost is controllable, and operation is reliable.

Description

Technical Field

[0001] The utility model relates to a PVC film production device, in particular to a PVC fine-pressed film leveling device. Background Art

[0002] The production process of PVC film mainly includes calendering process and blow molding process. The calendering process involves mixing polyvinyl chloride resin with other modifiers and calendering them into films through a calender. This process is suitable for producing films with a thickness of 0.08 - 0.2 mm, and those with a thickness greater than 0.25 mm are called PVC sheets. By adding functional processing aids such as plasticizers, stabilizers, and lubricants to PVC resin and then calendering into films, the resulting products have good heat preservation and light transmittance, are soft and easy to shape, and are suitable as outer covering materials for greenhouses, large and medium-sized sheds.

[0003] During the calendering process, there is a certain temperature difference at different parts of the PVC film. Since the extension effect of PVC material is positively correlated with temperature, under the same calendering conditions, PVC at different temperatures has different softening degrees, resulting in different internal stresses generated during calendering and also certain differences in the extension effect. These differences cause the film to not be able to maintain a completely flat state after cooling. Therefore, the current PVC film production industry needs to develop a leveling device that can level the PVC film to solve the above problems. Summary of the Invention

[0004] The utility model provides a PVC fine-pressed film leveling device, which solves the problems that the calendered PVC film may be uneven and locally deformed in the prior art.

[0005] The above technical problems of the utility model are mainly solved by the following technical solution: a PVC fine-pressed film leveling device, comprising: a frame, a transmission system, an inlet roller, an electromagnetic heating roller, two shaping rollers, and a winding roller. All the rollers are horizontally rotatably arranged relative to the frame. The shaping roller includes a core shaft, an outer cylinder, and spokes connecting the core shaft and the outer cylinder. The space between the outer cylinder and the core shaft is divided into several heat dissipation cavities by the spokes. The heat dissipation cavities are through at both ends. A plurality of heat dissipation fins extending towards the heat dissipation cavities are further provided on the inner side wall of the outer cylinder. The frame includes two parallel and vertically fixed side plates. The two ends of the two shaping rollers are respectively installed on the two side plates. A negative pressure fan is provided at one end of the side plates close to the two shaping rollers, and the suction end of the negative pressure fan faces the ends of the two shaping rollers.

[0006] The utility model can be installed online at the rear end of a PVC film calendering production device, and can level the film online. The specific treatment principle is as follows: The film flows through the guiding roller, the electromagnetic heating roller, between the two shaping rollers and the winding roller in sequence. The function of the guiding roller is to adjust the direction of the film so that it contacts the electromagnetic heating roller as much as possible, ensuring that the film is heated to the set temperature. The heating temperature of the electromagnetic heating roller is between 80 and 85 °C. After being heated, the film will soften, and this process will eliminate internal stress. Then, after being extruded by the two shaping rollers, the film becomes flat again. At the moment when the film contacts the shaping roller, part of the heat on the film will be taken away by the shaping roller, thus instantly cooling down by dozens of degrees, playing a role in shaping. The film that has been leveled is finally wound by the winding roller. The film is very thin, so the heat carried by the film per unit area is extremely small. However, over time, the heat accumulated on the shaping roller will gradually increase. After the temperature difference between the shaping roller and the film becomes smaller, the cooling effect on the film will be greatly reduced, thereby affecting the shaping effect of the film and ultimately leading to a decrease in the qualified product rate. Therefore, it is necessary to timely eliminate the heat accumulated inside the shaping roller. Since the rate of heat accumulation is slow, there is no need to cool it by water cooling. The utility model uses the method of heat transfer to dissipate heat from the shaping roller, that is, by increasing the contact area between the shaping roller and the air, reducing its own wall thickness at the same time, and cooperating with a negative pressure fan to promote the air flow rate inside the heat dissipation cavity and improve the heat conduction efficiency, thereby achieving a relatively high heat dissipation efficiency, and at the same time realizing a simple overall structure, controllable cost and reliable operation.

[0007] The negative pressure fan drives the air flow inside the heat dissipation cavity by generating a pressure difference at both ends of the heat dissipation cavity. The newly flowing-in air is external air, and its temperature is relatively low, so the cooling effect is good. If it is a blower, the external air will first pass through the blower and then flow to the heat dissipation cavity, and the motor on the blower will generate heat during operation, and these heats will be brought into the air, resulting in the air flow blown by the blower being slightly higher than the original ambient temperature.

[0008] Further, the shaping roller further includes an inner cylinder fixedly sleeved on the mandrel, and the spoke, the inner cylinder and the outer cylinder are an integrally cast structure. Furthermore, the casting materials of the spoke, the inner cylinder and the outer cylinder are aluminum alloy, and the aluminum alloy has a good heat transfer coefficient, which is beneficial to its own heat dissipation.

[0009] Therefore, the utility model has the following characteristics compared with the prior art: 1. The utility model first heats the film through the electromagnetic heating roller to soften it and eliminate internal stress, and then levels and cools and shapes the film through the two shaping rollers. The overall structure is simple, the cost is controllable, and the operation is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 is a schematic structural diagram of the utility model;

[0011] Appendix Figure 2 It is a schematic structural diagram of a shaping roller;

[0012] Appendix Figure 3 It is a transmission structure diagram of two shaping rollers. Specific Embodiment

[0013] The technical solution of the present utility model will be further specifically described below through embodiments in conjunction with the accompanying drawings.

[0014] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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, and therefore should not be construed as a limitation to the present utility model.

[0015] Embodiment 1: See Figure 1 and Figure 2 , a PVC fine-pressing film leveling device, comprising: a frame, a transmission system, an inlet roller 10, an electromagnetic heating roller 20, two shaping rollers 30 and a winding roller 40. All the rollers are horizontally rotatably arranged relative to the frame. The shaping roller includes a core shaft 31, an inner cylinder 32 fixedly sleeved on the core shaft, an outer cylinder 33 and spokes 34 connecting the inner cylinder and the outer cylinder. The space between the outer cylinder and the inner cylinder is divided into 6 heat dissipation cavities by the spokes. The heat dissipation cavities are through at both ends. There are also 18 heat dissipation fins 35 extending towards the heat dissipation cavities on the inner side wall of the outer cylinder. The heat dissipation fins, spokes, inner cylinder and outer cylinder are an integrally cast aluminum alloy structure, and the core shaft is carbon steel; the frame includes two parallel and vertically fixed side plates 50. Both ends of all the rollers are rotatably fitted with the two side plates through bearings 51. A negative pressure fan 60 is provided at one end of the side plate close to the two shaping rollers, and the suction end of the negative pressure fan faces the ends of the two shaping rollers.

[0016] This embodiment can be installed online at the rear end of the PVC film calendering production equipment, and can perform a flattening treatment on the film online. The specific processing principle is: the film flows through the introduction roller, the electromagnetic heating roller, the two shaping rollers and the winding roller in sequence, wherein the role of the introduction roller is to adjust the direction of the film so that it contacts the electromagnetic heating roller as much as possible, and ensure that the film is heated to the set temperature. The heating temperature of the electromagnetic heating roller is between 80 and 85 ° C. The film will soften after being heated. This process will eliminate the internal stress, and then the film will be flattened again after being squeezed by the two shaping rollers. At the same time, when the film contacts the shaping roller, the heat on the film will be taken away by the shaping roller, thereby instantly cooling down by dozens of degrees, playing a shaping role. The film after the flattening treatment is finally wound up by the winding roller. The film is very thin, so the heat carried by the unit area of the film is very small, but as time goes by, the heat accumulated on the shaping roller will gradually increase. When the temperature difference between the shaping roller and the film becomes smaller, the cooling effect on the film will be greatly reduced, thereby affecting the shaping effect of the film, and ultimately leading to a decrease in the yield rate. Therefore, it is necessary to eliminate the heat accumulated inside the shaping roller in time. Since the heat accumulation rate is slow, there is no need to cool it down by water cooling. This embodiment uses heat transfer to dissipate heat from the shaping roller, that is, by increasing the contact area between the shaping roller and the air, while reducing its own wall thickness, and using a negative pressure fan to promote the air circulation rate inside the heat dissipation cavity, improve the heat conduction efficiency, and thus achieve a relatively high heat dissipation efficiency, while achieving a streamlined overall structure, controllable costs, and reliable operation.

[0017] See Figure 3 A negative pressure cover 70 is provided on the outer cover of one side plate, and the negative pressure cover is opposite to the ends of the two shaping rollers. A negative pressure fan is provided on the negative pressure cover. Through holes are provided on the two side plates in the areas corresponding to the two ends of the two shaping rollers, and the through holes on one side are connected to the inner cavity of the negative pressure cover.

[0018] See Figure 3 , synchronous pulleys 80 of equal size are coaxially fixed on the same side of the two core shafts, and a synchronous belt 81 is connected between the two synchronous pulleys; a transmission gear 90 meshing with the transmission system is also coaxially fixed on one of the core shafts.

[0019] It is obvious to those skilled in the art that the utility model can be changed in many ways, and such changes are not considered to be out of the scope of the utility model. All such modifications obvious to those skilled in the art will be included in the scope of the claims.

Claims

1. A PVC fine-pressed film leveling device, characterized in that, Including: A frame, a transmission system, an inlet roller, an electromagnetic heating roller, two shaping rollers and a winding roller. All the rollers are horizontally rotatably arranged relative to the frame. The shaping roller includes a core shaft, an outer cylinder body and spokes connecting the core shaft and the outer cylinder body. The space between the outer cylinder body and the core shaft is divided into a plurality of heat dissipation cavities by the spokes. The heat dissipation cavities are through at both ends. A plurality of heat dissipation fins extending towards the heat dissipation cavities are further provided on the inner side wall of the outer cylinder body. The frame includes two parallel and vertically fixed side plates. The two ends of the two shaping rollers are respectively installed on the two side plates. A negative pressure fan is provided at one end of the side plates close to the two shaping rollers. The suction end of the negative pressure fan faces the ends of the two shaping rollers.

2. The PVC fine pressing film leveling device according to claim 1, characterized in that: The shaping roller further includes an inner cylinder body fixedly sleeved on the core shaft. The spokes, the inner cylinder body and the outer cylinder body are of an integral casting structure.

3. The PVC fine pressing film leveling device according to claim 1, wherein: A negative pressure cover is provided outside one of the side plates. The negative pressure cover faces the ends of the two shaping rollers. The negative pressure fan is provided on the negative pressure cover. Through holes are provided in the areas of the two side plates corresponding to the two ends of the two shaping rollers. The through holes on one side are communicated with the inner cavity of the negative pressure cover.

4. The PVC fine pressing film leveling device according to claim 2, characterized in that: Equal-sized synchronous pulleys are coaxially fixed on the same side of the two core shafts. A synchronous belt is connected between the two synchronous pulleys. A transmission gear meshing with the transmission system is further coaxially fixed on one of the core shafts.

5. The PVC fine pressing film leveling device according to claim 1, characterized in that: The heating temperature of the electromagnetic heating roller is between 80 and 85 °C.

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