Biodegradable film blowing device

Abstract

The utility model discloses a biodegradable film blowing device, which belongs to the technical field of film blowing devices and comprises an extrusion component and a stirring and mixing component, the extrusion component comprises a cylindrical shell, a screw rod rotationally arranged in an inner cavity of the cylindrical shell, a heating ring arranged on an outer ring of the cylindrical shell and a die head mounted at the top of the cylindrical shell, the stirring and mixing assembly comprises a stirring box and a stirring structure arranged in the stirring box; the stirring device further comprises a lifting assembly and a power assembly, and the lifting assembly is connected with the stirring box and used for driving the stirring box to vertically move relative to the cylindrical shell, so that switching between a stirring position for stirring materials and a feeding position for discharging is achieved; when the stirring box is located at the feeding position, an inner cavity of the stirring box communicates with an inner cavity of the cylindrical shell through a rectangular opening formed in the cylindrical shell, and the power assembly drives the screw rod and the stirring structure to rotate at the same time. The utility model provides the biodegradable film blowing device which integrates efficient mixing and stable film blowing.

Description

Technical Field

[0001] The utility model relates to the technical field of film blowing devices, in particular to a biodegradable film blowing device. Background Art

[0002] Film blowing technology (abbreviated as film blowing technology) is a key process in the field of plastics processing. It is widely used in the production of various film products such as packaging film, agricultural film, geomembrane, etc. As an alternative to traditional plastic film, the market demand and production technology of biodegradable film are also developing rapidly.

[0003] The formulation of biodegradable plastics is typically more complex than that of traditional general-purpose plastics. It often requires the blending and modification of multiple resin masterbatches with different melting points and viscosities with functional additives to produce films that meet specific performance requirements. Therefore, thorough and uniform mixing of the materials before film blowing is a key prerequisite for ensuring the quality of the final product.

[0004] At present, independent mixing equipment is usually used to melt and blend various raw materials to form uniform mixed particles, and then these particles are added to the hopper of the film blowing machine through a manual or automatic feeding system for film blowing. The disadvantage of this solution is that it requires the purchase of at least two sets of independent large-scale equipment, which leads to high costs and occupies a large amount of production workshop space. During transportation and storage, the mixed particles are exposed to the risk of absorbing moisture in the air or being contaminated by impurities, which will affect the quality of the final film product.

[0005] The integrated film blowing machine can simultaneously complete mixing and plasticizing during the conveying process of a single screw by lengthening the aspect ratio of the screw or designing a special screw configuration. Although this solution has a relatively compact structure, its disadvantage is that for biodegradable materials with complex components and large performance differences, the shearing and dispersion capabilities of a single screw are limited, which can easily lead to problems such as "crystal points", streaks, and uneven mechanical properties in the film. Utility Model Content

[0006] The purpose of the utility model is to provide a biodegradable film blowing device which integrates efficient mixing and stable film blowing.

[0007] To achieve the above objectives, the present invention adopts the following technical solutions: a biodegradable film blowing device, comprising an extrusion assembly and a stirring and mixing assembly. The extrusion assembly comprises a cylindrical shell, a screw rotatably disposed within the inner cavity of the cylindrical shell, a heating ring disposed on the outer ring of the cylindrical shell, and a die head mounted on the top of the cylindrical shell. The stirring and mixing assembly comprises a stirring box and a stirring structure disposed within the stirring box. A feed pipe for adding materials is provided at the top of the stirring box.

[0008] It also includes a lifting assembly and a power assembly, the lifting assembly is connected to the mixing box, and is used to drive the mixing box to move vertically relative to the cylindrical shell to achieve switching between a stirring position for stirring materials and a feeding position for unloading materials;

[0009] When the mixing box is located at the feeding position, the inner cavity of the mixing box is communicated with the inner cavity of the cylindrical shell through the rectangular opening provided on the cylindrical shell, and the power component simultaneously drives the screw rod and the mixing structure to rotate.

[0010] As a further description of the above technical solution: the lifting assembly is a plurality of hydraulic lifting columns fixed to the bottom wall of the mixing box.

[0011] As a further description of the above technical solution: the power assembly includes a motor and a mounting platform installed at the bottom thereof, and the output shaft of the motor is fixedly connected to the bottom of the screw rod.

[0012] As a further description of the above technical solution: the power assembly further includes a transmission mechanism, which transmits the power of the motor to the stirring structure;

[0013] The transmission mechanism includes a first pulley and a second pulley sleeved on the outer ring of the spiral rod, and the first pulley and the second pulley are connected by a belt transmission;

[0014] It also includes a rotating rod, the bottom of which is slidably connected to the first pulley, and the top of which extends into the inner cavity of the mixing box to drive the mixing structure.

[0015] As a further description of the above technical solution: the driving of the stirring structure is realized through a gear assembly, which includes a driving gear fixed to the outer ring of the rotating rod, and a driven gear ring meshing with the driving gear, and the main body of the stirring structure is fixedly connected to the driven gear ring.

[0016] As a further description of the above technical solution: the stirring structure includes a plurality of vertical plates fixed to the outer ring of the driven gear ring, and a plurality of stirring rods fixed to the outer ring of the vertical plates.

[0017] As a further description of the above technical solution: an air ring is installed above the die head to inflate and cool the film embryo extruded from the die head.

[0018] As a further description of the above technical solution: support legs are fixed to the bottom of the cylindrical shell for stably supporting it on the ground.

[0019] As a further description of the above technical solution: the bottom of the first pulley is rotatably mounted on the hollow column, and the rotating rod passes through the inner cavity of the hollow column.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] 1. The independent stirring and mixing function is integrated with the extrusion and film blowing function through a vertical lifting structure, eliminating the need for independent mixing equipment and the material conveying system between the two. This greatly reduces the equipment's footprint and significantly reduces the initial investment cost of equipment procurement and site construction.

[0022] 2. The lifting assembly drives the mixing box to switch between the stirring position and the feeding position. After the materials are mixed, they enter the extruder directly by gravity, which greatly simplifies the production process and improves the overall automation level and production efficiency.

[0023] 3. Using a single motor to drive the screw and stirring mechanism simultaneously significantly reduces the installed power and actual operating energy consumption of the device compared to the traditional split-type solution that requires two independent motors to drive the mixer and extruder respectively.

[0024] 4. During the initial material preparation and stirring stage, the heating ring located outside the cylindrical shell can be turned on to preheat the material in the stirring box and shorten the subsequent melting time.

[0025] 5. An independent stirring and mixing component and a dedicated stirring structure are set up to fully pre-mix multi-component and highly differentiated biodegradable materials before extrusion, ensuring a high degree of uniformity of the materials entering the screw, thereby effectively avoiding film quality problems caused by uneven mixing and significantly improving the performance stability and appearance uniformity of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Shows a front view of the utility model;

[0027] Figure 2 Shows a cross-sectional view of the utility model;

[0028] Figure 3 Shows the utility model Figure 2 A magnified view of the middle part;

[0029] Figure 4 Shown is a stereoscopic view of the rotating rod and the hollow column of the utility model.

[0030] Legend:

[0031] 10. Mixing box; 101. Feed pipe; 11. Hydraulic lifting column; 12. Cylindrical shell; 121. Rectangular mouth; 13. Die head; 14. Air ring; 15. Screw rod; 16. Heating ring; 17. Motor; 18. Rotating rod; 19. First pulley; 20. Second pulley; 21. Mounting platform; 22. Support leg; 23. Hollow column; 24. Driving gear; 25. Driven gear ring; 26. Vertical plate; 27. Mixing rod. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 4 The utility model provides a technical solution: a biodegradable film blowing device, including an extrusion component and a stirring and mixing component.

[0034] The extrusion assembly is the basic part for realizing material plasticization and film embryo forming. Its overall structure remains fixed during operation. The assembly includes a hollow cylindrical shell 12, the bottom of which is stably fixed to the ground by a number of support legs 22. In the inner cavity of the cylindrical shell 12, a screw rod 15 is rotatably arranged for conveying, compressing and plasticizing the material.

[0035] A heating ring 16 is fixedly mounted on the outer ring of the cylindrical shell 12 for heating the material in the shell until it is molten. A die 13 for extruding the molten material to form an annular membrane embryo is installed at the top discharge end of the cylindrical shell 12. In order to inflate and shape the membrane embryo, an air ring 14 is also installed directly above the die 13. In order to receive the material from the stirring and mixing assembly, several rectangular openings 121 are opened on the side wall of the cylindrical shell 12 as feed ports.

[0036] The stirring and mixing assembly is used for pre-mixing of raw materials, and includes a stirring box 10 and a stirring structure arranged in its inner cavity. A feeding pipe 101 is provided on the top of the stirring box 10 to facilitate operators to add raw materials such as biodegradable plastic particles therein.

[0037] One of the key features of this device is the relative motion relationship between the two components, which is achieved through a set of lifting components. Specifically, the lifting components are several hydraulic lifting columns 11, the upper ends of which are fixedly connected to the bottom wall of the mixing box 10. By controlling the extension and retraction of the hydraulic lifting columns 11, the entire mixing box 10 can be driven to move vertically smoothly relative to the fixed cylindrical shell 12.

[0038] The hydraulic lifting columns 11 are connected via parallel oil circuits and are equipped with hydraulic synchronization valves to ensure consistency in multi-cylinder motion. At the same time, guide structures, such as guide grooves and sliders (not shown), are provided between the mixing box 10 and the cylindrical shell 12 to further ensure lifting stability.

[0039] This movement enables the mixing box 10 to switch between two positions, one of which is a higher mixing position, such as Figure 1As shown, at this time, the bottom of the mixing box 10 is higher than the rectangular opening 121, and the inner cavity is isolated from the cylindrical shell 12; the second is a lower feeding position, such as Figure 2 As shown, at this time, the mixing box 10 descends, so that its inner cavity communicates with the inner cavity of the cylindrical shell 12 through the rectangular opening 121.

[0040] Another key feature of this device is its power drive method, which is completed by a set of power components. Specifically, the power component includes a motor 17, which is fixed to a mounting platform 21 placed on the ground to ensure stable operation. The output shaft of the motor 17 is fixedly connected to the bottom of the screw rod 15, thereby directly driving the screw rod 15.

[0041] Furthermore, the power assembly is designed to be able to drive the stirring structure at the same time. Specifically, this is achieved through a transmission mechanism. The transmission mechanism utilizes the screw rod 15 driven to rotate by the motor 17 as part of the power source. A second pulley 20 is provided on the outer ring of the screw rod 15. At the same time, a first pulley 19 is provided. The first pulley 19 is connected to the second pulley 20 through a belt. In order to stably support the transmission part, the bottom of the first pulley 19 is rotatably installed on a hollow column 23, and the hollow column 23 is installed on the ground.

[0042] The bottom of a rotating rod 18 is slidably connected to the first pulley 19 and passes through the inner cavity of the hollow column 23. The top of the rotating rod 18 extends vertically upward into the inner cavity of the mixing box 10 to transmit power to the mixing structure.

[0043] Specifically, the sliding connection means that the bottom of the rotating rod 18 cooperates with the first pulley 19 through a spline or sleeve structure, so that it can slide relatively in the axial direction to adapt to the lifting and lowering of the mixing box 10, and at the same time transmits circumferential torque through the keyway, such as Figure 4 shown.

[0044] The final drive of the stirring structure is completed by a set of gear components. Specifically, the gear component includes a driving gear 24 fixed to the outer ring of the rotating rod 18 and a driven gear ring 25 meshing with the driving gear 24.

[0045] The main body of the stirring structure is fixedly connected to the driven gear ring 25 . Specifically, the stirring structure includes a plurality of vertical plates 26 fixed to the outer ring of the driven gear ring 25 , and a plurality of stirring rods 27 fixed to the outer ring of the vertical plates 26 .

[0046] The workflow is as follows:

[0047] First, the lifting assembly drives the mixing box 10 to a higher mixing position. At this position, the material cannot enter the extrusion assembly. The operator puts the raw materials into the mixing box 10 through the feed pipe 101, starts the power assembly, and the motor 17 starts working. At this time, the motor 17 directly drives the screw rod 15 to idle on the one hand, and drives the mixing structure to rotate in the mixing box 10 through the transmission mechanism and gear assembly on the other hand, so as to fully and evenly mix the materials.

[0048] After the materials are evenly mixed, the power assembly is stopped and the lifting assembly is started to smoothly lower the mixing box 10 to the feeding position. At this position, the inner cavity of the mixing box 10 is aligned and connected with the rectangular opening 121 of the cylindrical shell 12. The mixed materials automatically flow into the cylindrical shell 12 of the extruder assembly under the action of gravity.

[0049] Start the power assembly again, the motor 17 drives the screw 15 to rotate, and transports the material entering the shell upward. During this process, the heating ring 16 heats the material to a molten state, and the screw 15 pressurizes the melt and pushes it toward the die head 13. The melt is squeezed out from the annular gap of the die head 13 to form a tubular membrane embryo. The air ring 14 is then started, blowing compressed air into the membrane embryo to expand it into a membrane bubble, and blowing cooling air to the outer surface of the membrane bubble to quickly solidify and shape it.

[0050] The formed film is pulled and flattened from above and finally rolled up as a finished product.

[0051] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A biodegradable film blowing device, comprising an extrusion component and a stirring and mixing component, characterized in that: The extrusion assembly includes a cylindrical shell (12), a screw rod (15) rotatably arranged in the inner cavity of the cylindrical shell (12), a heating ring (16) arranged on the outer ring of the cylindrical shell (12), and a die head (13) installed on the top of the cylindrical shell (12). The stirring and mixing assembly includes a stirring box (10) and a stirring structure arranged in the stirring box (10). A feeding pipe (101) for adding materials is provided on the top of the stirring box (10); It also includes a lifting assembly and a power assembly, wherein the lifting assembly is connected to the mixing box (10) and is used to drive the mixing box (10) to move vertically relative to the cylindrical shell (12) to achieve switching between a stirring position for stirring materials and a feeding position for unloading materials; When the mixing box (10) is located at the feeding position, the inner cavity of the mixing box (10) is communicated with the inner cavity of the cylindrical shell (12) through the rectangular opening (121) provided on the cylindrical shell (12), and the power assembly simultaneously drives the screw rod (15) and the mixing structure to rotate.

2. A biodegradable film blowing device according to claim 1, characterized in that: The lifting components are a plurality of hydraulic lifting columns (11) fixed to the bottom wall of the mixing box (10).

3. The biodegradable film blowing device according to claim 1, characterized in that: The power assembly comprises a motor (17) and a mounting platform (21) mounted on the bottom thereof, and the output shaft of the motor (17) is fixedly connected to the bottom of the screw rod (15).

4. The biodegradable film blowing device according to claim 3, characterized in that: The power assembly further includes a transmission mechanism, which transmits the power of the motor (17) to the stirring structure; The transmission mechanism comprises a first pulley (19) and an outer ring second pulley (20) sleeved on the spiral rod (15), and the first pulley (19) and the second pulley (20) are connected via a belt transmission; It also includes a rotating rod (18), the bottom of which is slidably connected to the first pulley (19), and the top of which extends into the inner cavity of the stirring box (10) to drive the stirring structure.

5. The biodegradable film blowing device according to claim 4, characterized in that: The stirring structure is driven by a gear assembly, which includes a driving gear (24) fixed to the outer ring of the rotating rod (18) and a driven gear ring (25) meshing with the driving gear (24). The main body of the stirring structure is fixedly connected to the driven gear ring (25).

6. The biodegradable film blowing device according to claim 5, characterized in that: The stirring structure comprises a plurality of vertical plates (26) fixed to the outer ring of the driven gear ring (25), and a plurality of stirring rods (27) fixed to the outer ring of the vertical plates (26).

7. The biodegradable film blowing device according to claim 1, characterized in that: An air ring (14) is installed above the die head (13) for inflating and cooling the film embryo extruded from the die head (13).

8. The biodegradable film blowing device according to claim 1, characterized in that: Support legs (22) are fixed to the bottom of the cylindrical shell (12) for stably supporting it on the ground.

9. The biodegradable film blowing device according to claim 4, characterized in that: The bottom of the first pulley (19) is rotatably mounted on the hollow column (23), and the rotating rod (18) is slidably connected to the inner cavity of the hollow column (23).

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