PVC film cooling device

Abstract

The utility model relates to a PVC (polyvinyl chloride) film cooling device. An annular air cavity is formed in the annular air blowing base, an air outlet is formed in the annular air blowing base, and a plurality of air inlet pipes are arranged at the bottom of the annular air blowing base. The flow guide plate modules are distributed on the outer side of the annular air blowing base in a circumferential array mode and comprise rotating shafts, flow guide plates, connecting rods and annular positioning plates, the connecting rods and the annular positioning plates are adjustably fixed, all the flow guide plates are arranged upwards and are the same in overturning angle, and nozzles capable of spraying air flow upwards are defined by the inner sides of all the flow guide plates. According to the utility model, the turnover angle of the guide plates can be changed by adjusting the fixed positions of the connecting rods and the annular positioning plate, so that the shielding part of any two adjacent guide plates can be enlarged or reduced, and the air flow is further controlled. Therefore, the utility model has the advantages of lower production cost and higher reliability.

Description

Technical Field

[0001] The utility model relates to a blow molding device, in particular to a PVC film cooling device. Background Art

[0002] The production process of PVC film mainly includes calendering process and blow molding process. The calendering process involves mixing PVC resin with other modifiers and then calendering into film through a calender. This process is suitable for producing PVC 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 film, a PVC film with good heat preservation and light transmittance can be obtained, which is suitable as an outer covering material for greenhouses, large and medium-sized sheds. The blow molding process is to melt and extrude PVC raw materials into a thin tube, and then use compressed air to blow it up into a bubble shape. After cooling and shaping, a film product is obtained. The PVC film produced by the blow molding process has the advantages of simple equipment, low investment, and quick results, and is suitable for producing PVC films with a thickness of 0.01 - 0.25 mm, so it is widely used.

[0003] The blow molding process is specifically as follows: Add plastic into an extruder, melt it, and extrude it from the annular gap of the front end die to form a cylindrical (tube) shape. Compressed air is introduced through the central hole of the mandrel of the machine head to blow up the plastic cylinder into a bubble tube shape (generally blown up 2 - 3 times). At this time, there is elongation in both the longitudinal and transverse directions, obtaining a bubble tube with a certain blow-up ratio. And a wind ring cooling system is arranged outside the plastic cylinder to cool the blown-up plastic bubble tube. Then it enters the guiding splints and the traction pinch rolls to flatten the bubble tube, preventing the air inside the bubble tube from leaking out to maintain the required constant blow-up pressure. Flattening the bubble tube forms a flat-fold double-layer film, and finally it enters the coiling device for coiling.

[0004] The air outlet diameter of the existing wind ring cooling system is fixedly set. To adjust the wind speed, it is necessary to control the rotation speed of multiple blowers through a wind speed adjustment program. Once the wind speed is adjusted, as long as the products produced remain unchanged, generally there is no need to adjust the wind speed anymore. Therefore, the system used to control the wind speed has a relatively low actual application frequency, while the cost is not low. Summary of the Invention

[0005] The utility model provides a PVC film cooling device, which solves the problem that the wind speed control system for cooling in blow molding equipment in the prior art has a relatively low actual application frequency and a relatively high cost.

[0006] The above technical problems of the utility model are mainly solved by the following technical solutions: A PVC film cooling device includes:

[0007] A circular blower base, with an annular air cavity formed inside it. An air outlet communicating with the annular air cavity is provided on the upper side of the circular blower base. A number of air inlet pipes extend outward from the bottom or side of the circular blower base. The air inlet pipes are connected to a blower, and the inner cavity of the air inlet pipes communicates with the annular air cavity. The annular inner side wall of the circular blower base defines a blow molding cavity;

[0008] A number of deflector modules, which are distributed in a circumferential array on the outside of the circular blower base. It includes a rotating shaft fixed to the outside of the circular blower base, a deflector rotatably connected to the rotating shaft, a connecting rod hinged to the outside of the deflector, and an annular positioning plate fixed to the outside of the circular blower base. Multiple deflector modules share one annular positioning plate. The connecting rod and the annular positioning plate are adjustably fixed. All deflectors are arranged upward and have the same flipping angle. The inner sides of all the deflectors define a nozzle through which air can be ejected upward. The upper ends of adjacent deflectors partially cover each other, and the covering direction is the same, that is, any deflector will partially cover the outer side of the deflector on its left, or any deflector will partially cover the outer side of the deflector on its right;

[0009] The whole of the present utility model is installed outside the extrusion outlet of a blow molding device. The blown bubble tube is output from the blow molding cavity from bottom to top. The operating principle of the present utility model: The blower can continuously and stably input air into the air inlet pipes. These airflows enter the annular air cavity through the air inlet pipes and then are blown upward from the air outlet. The airflows are finally ejected from the nozzle under the constraint of the deflectors, and can continuously blow air to cool the bubble tube.

[0010] By adjusting the fixed position of the connecting rod and the annular positioning plate of the present utility model, the flipping angle of the deflector can be changed. In this way, the overlapping part of any two adjacent deflectors will also increase or decrease, thereby controlling the aperture of the nozzle. When the air volume blown in the annular air cavity is constant, the larger the aperture of the nozzle, the slower the airflow ejected by the present utility model. On the contrary, the smaller the aperture of the nozzle, the faster the airflow ejected by the present utility model. In this way, the present utility model only needs to be equipped with a blower device that can continuously and stably blow air, and by manually adjusting the fixed position of the connecting rod and the annular positioning plate, the fine adjustment of the wind speed can be achieved.

[0011] Further, a number of guiding grooves are provided on the annular positioning plate in a circumferential array. The guiding grooves are distributed radially outward. The connecting rod passes through the corresponding guiding grooves. A bottom limiting portion is provided at the end of the connecting rod, and an adjusting nut is screwed on the middle section of the connecting rod. When the adjusting nut is tightened, the adjusting nut and the bottom limiting portion will clamp and fix on both sides of the annular positioning plate. At this time, the connecting rod and the annular positioning plate are relatively fixed. When the adjusting nut is loosened, the connecting rod can move relative to the guiding grooves for easy adjustment.

[0012] Further, the utility model further includes a turntable covering the upper side of the annular positioning plate and rotatably connected thereto. The turntable is circumferentially and arrayed with inclined slots intersecting with the guiding slots, and the connecting rods penetrate through the inclined slots at the same time. Through the above scheme, the utility model can synchronously control the synchronous movement of all the connecting rods by rotating the turntable, ensure the synchronous flipping of all the flow guiding plates, with extremely high adjustment efficiency and reduced adjustment difficulty. After the adjustment is completed, the adjusting nut is tightened again.

[0013] Further, a plurality of flow guiding vanes are circumferentially and arrayed in the annular air cavity. The cross section of the flow guiding vane is arc-shaped, and the tangent line at the lower end tends to be horizontal, while the tangent line at the upper end tends to be vertical. Through the above technical scheme, the air flow in the annular air cavity will be more evenly output from the air outlet under the guidance of the flow guiding vanes, and the output direction tends to be vertically upward.

[0014] Therefore, the utility model has the following characteristics compared with the prior art: 1. The air blowing volume of the utility model is fixed, and the caliber of the nozzle is controlled through a mechanical structure, thereby realizing the change of the wind speed at the nozzle. The production cost of the whole set of structure is relatively low, and the operation reliability is high; 2. The utility model can synchronously control the synchronous movement of all the connecting rods by rotating the turntable, ensure the synchronous flipping of all the flow guiding plates, with extremely high adjustment efficiency and reduced adjustment difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. Figure 1 is a schematic structural diagram of the utility model;

[0016] FIG. Figure 2 is an enlarged view of part A of FIG. Figure 1 ;

[0017] FIG. Figure 3 is an assembly drawing of the connecting rod in Embodiment 1;

[0018] FIG. Figure 4 is a schematic structural diagram of the utility model after the nozzle is reduced;

[0019] FIG. Figure 5 is a schematic structural diagram of the annular air blowing base;

[0020] FIG. Figure 6 is a cross-sectional view of the flow guiding plate constituting the nozzle;

[0021] FIG. Figure 7 is a structural diagram of the turntable, annular positioning plate and structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solution of the utility model will be further specifically described below through embodiments and in conjunction with the drawings.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is 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. Therefore, it should not be construed as a limitation to the present utility model.

[0024] Embodiment 1: See Figure 1 and Figure 4 , a PVC film cooling device, comprising:

[0025] A circular air-blowing seat 100, which has a circular air cavity 110 formed inside it. An air outlet 120 communicating with the circular air cavity is provided on the upper side of the circular air-blowing seat. Three air inlet pipes 130 are extended outward from the bottom or side of the circular air-blowing seat. The air inlet pipes are connected to a blower, and the inner cavity of the air inlet pipes communicates with the circular air cavity. The circular inner side wall of the circular air-blowing seat defines a blow molding cavity 140 (see Figure 5 );

[0026] Ten sets of deflector modules 200 are distributed in a circumferential array on the outside of the circular air-blowing seat. It includes a rotating shaft 210 fixed to the outside of the circular air-blowing seat, a deflector 220 rotatably connected to the rotating shaft, a connecting rod 230 hinged to the outside of the deflector, and a circular positioning plate 240 fixed to the outside of the circular air-blowing seat. The ten sets of deflector modules share one circular positioning plate. The connecting rod and the circular positioning plate are adjustably fixed. All deflectors are arranged upward and have the same flipping angle. The inner sides of all deflectors define a nozzle 250 from which air can be ejected upward. Any deflector will partially block the outer side surface of the deflector on its right side (see Figure 6 );

[0027] This embodiment is integrally installed outside the extrusion outlet of the blow molding equipment. The blown bubble tube is output from the blow molding cavity from bottom to top. The operating principle of this embodiment: The blower can continuously and stably input air into the air pipes. These air flows enter the circular air cavity through the air pipes and then are blown upward from the air outlet. The air flows are finally ejected from the nozzle under the constraint of the deflectors, and can continuously blow air to cool the bubble tube.

[0028] In this embodiment, by adjusting the fixed position of the connecting rod and the annular positioning plate, the flipping angle of the deflector can be changed. In this way, the overlapping part between any two adjacent deflectors will also increase or decrease, thereby controlling the diameter of the nozzle. When the air blowing volume in the annular air cavity is constant, the larger the diameter of the nozzle, the slower the air flow ejected from this embodiment; conversely, the smaller the diameter of the nozzle, the faster the air flow ejected from this embodiment. Thus, this embodiment only needs to be equipped with a blower device that can continuously and stably blow air, and by manually adjusting the fixed position of the connecting rod and the annular positioning plate, fine adjustment of the wind speed can be achieved.

[0029] See Figure 3 and Figure 7 , 10 guide grooves 241 are arranged in a circular array on the annular positioning plate. The guide grooves are distributed radially outward. The connecting rod passes through the corresponding guide grooves. A bottom limiting portion 231 is provided at the end of the connecting rod, and an adjusting nut 232 is screwed on the middle section of the connecting rod. When the adjusting nut is tightened, the adjusting nut and the bottom limiting portion will clamp and fix on both sides of the annular positioning plate. At this time, the connecting rod is relatively fixed to the annular positioning plate. When the adjusting nut is loosened, the connecting rod can move relative to the guide groove for easy adjustment.

[0030] See Figure 2 , Figure 3 and Figure 7 , this embodiment further includes a turntable 260 that covers the upper side of the annular positioning plate and is rotatably connected. Oblique grooves 261 that intersect with the guide grooves are arranged in a circular array on the turntable, and the connecting rod passes through the oblique grooves at the same time; a plurality of arc grooves 262 coaxial with the turntable are provided on the turntable, and a screw rod 242 fixed to the annular positioning plate is arranged in the arc grooves, and a tightening nut 243 is screwed on the screw rod. Through the above scheme, this embodiment can synchronously control the synchronous movement of all the connecting rods by rotating the turntable, ensuring that all the deflectors flip synchronously, with extremely high adjustment efficiency and reduced adjustment difficulty. After the adjustment is completed, tighten the tightening nut and the adjusting nut.

[0031] See Figure 6 , a number of guide vanes 150 are distributed in a circular array in the annular air cavity. The cross-section of the guide vanes is circular arc-shaped, and the tangent line at the lower end is inclined to be horizontal, and the tangent line at the upper end is inclined to be vertical. Through the above technical scheme, the air flow in the annular air cavity will be more evenly output from the air outlet under the guidance of the guide vanes, and the output direction tends to be vertically upward.

[0032] The air inlet pipe is connected to the bottom of the circular blower base. The axial direction of the air inlet pipe is inclined to the tangent direction of the annular air cavity at its connection part, and the inclination angle is less than 45°. The smaller the inclination angle, the more the air flow entering the annular air cavity from the air inlet pipe tends to be horizontal. In this way, the air flow can flow farther in the annular air cavity, facilitating the uniformity of the air flow.

[0033] It will be apparent to those skilled in the art that the present utility model can be changed in various ways, and such changes are not considered to depart from the scope of the present utility model. All such modifications that are obvious to those skilled in the art will be included within the scope of the present claims.

Claims

1. A PVC film cooling device, characterized in that, Comprising: A circular blower base, within which a circular air cavity is formed. An air outlet communicating with the circular air cavity is provided on the upper side of the circular blower base. A plurality of air inlet pipes extend outward from the bottom or side of the circular blower base, and the inner cavity of the air inlet pipe communicates with the circular air cavity. The annular inner sidewall of the circular blower base defines a blow molding cavity; A plurality of deflector modules, which are distributed in a circumferential array on the outside of the circular blower base. It includes a rotating shaft fixed to the outside of the circular blower base, a deflector rotatably connected to the rotating shaft, a connecting rod hinged to the outside of the deflector, and an annular positioning plate fixed to the outside of the circular blower base. The connecting rod and the annular positioning plate are fixedly adjustable. All deflectors are arranged upward and have the same flipping angle. The inner sides of all the deflectors define a nozzle through which air can be ejected upward; By adjusting the fixed position of the connecting rod and the annular positioning plate, the flipping angle of the deflector can be changed, thereby controlling the diameter of the nozzle.

2. The PVC film cooling device according to claim 1, wherein: A plurality of guiding grooves are arranged in a circumferential array on the annular positioning plate. The guiding grooves are distributed radially outward. The connecting rod passes through the corresponding guiding groove. A bottom limiting portion is provided at the end of the connecting rod, and an adjusting nut is screwed on the middle section of the connecting rod.

3. The PVC film cooling device according to claim 2, characterized in that: It further includes a turntable covering the upper side of the annular positioning plate and rotatably connected thereto. Oblique grooves intersecting with the guiding grooves are arranged in a circumferential array on the turntable, and the connecting rod passes through the oblique grooves simultaneously.

4. The PVC film cooling device according to claim 3, wherein: A plurality of arc-shaped grooves coaxial with the turntable are provided on the turntable. A screw rod fixed to the annular positioning plate is arranged in the arc-shaped groove, and a tightening nut is screwed on the screw rod.

5. The PVC film cooling device according to claim 1, characterized in that: A plurality of guiding vanes are distributed in a circumferential array in the circular air cavity. The cross section of the guiding vane is circular arc-shaped, and the tangent line at the lower end tends to be horizontal, while the tangent line at the upper end tends to be vertical.

6. The PVC film cooling device according to claim 5, characterized in that: The air inlet pipe is connected to the bottom of the circular blower base, and the axial direction of the air inlet pipe is inclined to the tangent direction of the circular air cavity at the connecting part, and the inclination angle is less than 45°.

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