Preparation system of biodegradable mulching film

Abstract

The invention relates to the technical field of mulching films, in particular to a biodegradable mulching film preparation system which comprises a traction rack, an extruder, a machine head, a die head air ring, a coiling and cutting machine, a flow divider, a flow dividing disc, a driving assembly, a long sealing plate, a bottom bin and a material storage tank, the extruder is arranged at the top of the traction rack, the machine head is arranged at the output end of the extruder, and the die head air ring is arranged at the output end of the extruder. The die head air ring is installed at the top end of the machine head, and the flow divider is connected between the machine head and the extruder. The driving assembly is used for enabling the flow dividing disc to rotate, so that a solution flowing channel is changed from a straight line to be inclined upwards, the internal resistance of the flow divider is increased, the flow speed of materials in an extruder is reduced, the materials are fully treated, blockage is reduced, impact and abrasion to a screw can be effectively relieved, and through coarse material separation, the screw is prevented from being damaged. Replacement of parts in the production peak period is reduced, the downtime of a production line is shortened, the service life of the screw can be prolonged, and the production requirement of the peak period is met.

Description

Technical Field

[0001] This invention relates to the field of mulch film technology, specifically to a system for preparing a biodegradable mulch film. Background Technology

[0002] Potatoes, also known as Irish potatoes, rely on plastic film for insulation and moisture retention in modern potato cultivation. However, plastic film is not easily recycled, leaving residues in the soil. Even if recycled, it cannot be reused or resold, leading to the accumulation of waste plastic film, which seriously affects environmental sanitation and negatively impacts secondary cultivation of the soil. Therefore, the country strongly advocates and subsidizes biodegradable plastic film, and the market prospects for biodegradable plastic film are becoming increasingly broad.

[0003] Potatoes are typically grown annually or twice a year. For example, Anding District in Dingxi City, Gansu Province, is one of the three most suitable potato-growing areas in China. Gansu Province has a very high potato yield, with a planting area of ​​10.3 million mu (approximately 620,000 hectares). The estimated fresh potato yield is 15.5 million tons. The main planting period is generally from mid-April to early May. Therefore, the peak season for demand for agricultural film is from March to May. Generally, spring agricultural film production begins from December to January of the following year, and the peak production and sales period is from February to May. In May, most agricultural film production enterprises stop production for machine maintenance. There is a small peak in the autumn. Most of the orders are concentrated in the spring, generally for three to four months.

[0004] The potatoes used in this project all utilize starch-based biodegradable mulch film. This film is produced by adding fatty polyester compounds to a starch-based mulch film material. Common additives include polyvinyl chloride (PVC), ethylene / acrylic acid copolymer (EAA), and polyvinyl alcohol (PVA). During the degradation process by microorganisms in the soil, the starch in the mulch film initially breaks down into small fragments of polymeric materials. These biodegradable polymer fragments then continue to degrade in the soil. Currently, the production process for biodegradable mulch film involves mixing and stirring these raw materials, extruding them into strips, air-cooling them, cutting them into fragments, and then feeding them into a blown film machine. The basic flow of the blown film process includes raw material processing, extrusion, cooling, stretching, and winding. First, the plastic raw materials are melted and mixed to create a melt suitable for blown film production. Then, the melt is extruded through the screw of an extruder to form a tubular plastic film. Next, the film is rapidly cooled and solidified using a cooling device. Subsequently, the film is stretched using a stretching device to improve its mechanical properties. Finally, the film is wound and cut into suitable sizes.

[0005] During peak production, all components of the equipment operate at high frequencies. The raw materials are first processed by the extruder. The extruder works by using external heating and internal screw extrusion to break down the material into powder. The screw typically has a service life of two to three years. After the first maintenance, the screw is very prone to damage during the second use.

[0006] The main reason for screw damage is that the screw rotates inside the barrel of the blown film machine, and the friction between the material and both causes gradual wear on the working surfaces of the screw and barrel. The screw diameter gradually decreases, while the inner diameter of the barrel gradually increases. This results in a gradually widening gap between the screw and barrel as they wear down. However, since the resistance of the die head and distributor in front of the barrel remains unchanged, this increases the leakage flow of the extruded material as it moves forward. This means an increased flow of material from the diameter gap towards the feed direction, causing blockage at the die head distributor. Consequently, the machine's production output decreases. This phenomenon also increases the residence time of the material inside the barrel. Because the starch-based biodegradable film contains polyvinyl chloride, the hydrogen chloride gas produced during decomposition intensifies the corrosion of the blown film machine screw and barrel, especially during peak periods when the daily production of medium-sized equipment is low. When the weight reaches 30 catties, it puts a significant load and wear on the internal screw, affecting both the air ring and the die head. However, medium-sized enterprises consider that biodegradable mulch film requires good environmental conditions, and that prolonged storage can lead to excessive degradation during use, severely impacting its effectiveness. They also consider the number of cooperative customers and therefore do not store too much film in advance. However, due to production demands, the equipment is forced to operate at full load for several days, further exacerbating screw damage. This results in frequent screw repairs and replacements during peak periods. During this time, repairs and replacements not only take several days for disassembly and installation, but also require continuous adjustments over several days of production, such as the angular distance between the air ring, die head, and traction equipment, and the alignment of the air ring vents with the die head. This consumes a significant amount of prime sales time.

[0007] To address this, a biodegradable mulch film preparation system is proposed, which reduces screw wear during mulch film preparation, extends service life, and ensures timely production of biodegradable mulch film. Summary of the Invention

[0008] The purpose of this invention is to provide a system for preparing biodegradable mulch film, which solves the problems of large leakage flow caused by the screw in the extruder, material accumulation, and excessive material retention time in the cylinder, which exacerbate wear and affect peak production dates.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A system for preparing a biodegradable mulch film includes a traction frame, an extruder, a die head, a die head air ring, and a winding and cutting machine. The extruder is located at the top of the traction frame, the die head is located at the output end of the extruder, and the die head air ring is installed at the top of the die head. The system also includes a distributor, a distributor plate, a drive assembly, a long sealing plate, a bottom chamber, and a storage tank. The distributor is connected between the die head and the extruder. The distributor includes a housing and a discharge port, with the discharge port located at the bottom of the housing. The distributor plate and the drive assembly are both connected inside the housing. When the internal pressure of the distributor exceeds a set value, the drive assembly drives the distributor plate to rotate counterclockwise to a set position. A long sealing plate is fixedly installed on one side of the distributor plate. An isolation zone exists between the discharge port and the long sealing plate, with the discharge port located below the isolation zone and the long sealing plate located above the isolation zone. Below the distributor, coarse material will naturally slide down into the isolation zone due to fluid compression and gravity, accumulating there. When the distributor plate is in the set position, it works with the elongated sealing plate and distributor to seal the isolation zone, preventing fluid from entering. As a result, a large amount of coarse material will be stored inside the isolation zone. When the distributor plate is in the vertical position, the discharge port is closed. As the distributor plate rotates, the discharge port gradually opens. When the discharge port gradually opens, the isolation zone is in a semi-sealed state. At the same time, the distributor plate transitions quickly to prevent rapid pressure relief from causing a large amount of fluid to enter. When the discharge port opens, the coarse material in the upper isolation zone will pass through the discharge port for storage. The bottom hopper is connected to the bottom of the shell, and the top of the bottom hopper is connected to the shell through the discharge port. The storage tank is placed inside the bottom hopper, meaning that the isolation zone is connected to the storage tank when the discharge port is open for rapid discharge.

[0011] In the above solution, the conventional method would trap the coarse material inside the extruder and allow it to decompose continuously. However, this would lead to material accumulation at that location. The prolonged material retention and decomposition would cause more severe wear on the screw, necessitating shutdown for cooling. During peak production periods, overload would further exacerbate internal damage to the extruder, creating a vicious cycle. By using a distributor to create a reserved space between the distributor plate and the extruder to store the coarse material, damage to the extruder is reduced. At the same time, the rotation of the distributor plate changes the direction of fluid flow, thereby slowing down the fluid velocity in the extruder and reducing the vicious cycle caused by accumulated wear.

[0012] Optionally, the drive assembly can utilize a cylinder motor and sensing equipment to separate materials. The sensing equipment detects internal pressure and the degree of blockage. However, this method requires repeated testing, and the cost of cooperating with the cylinder drive equipment is relatively high for small and medium-sized enterprises. In addition, the screw itself has a lifespan of 2 to 3 years. It is sufficient to ensure that the screw does not suffer serious damage during peak periods. When entering low production periods, there are several months to maintain and replace the entire equipment.

[0013] Preferably, the distributor further includes a sealing platform, a short perforated plate, and a limiting perforated plate. The sealing platform and the limiting perforated plate are connected inside the housing. The sealing platform is located below the output end of the extruder. The short perforated plate is connected to the top of the sealing platform. The short perforated plate and the limiting perforated plate are located on both sides of the distributor plate. Both the long sealing plate and the short perforated plate have large filter holes. The side of the long sealing plate closest to the distributor plate does not have large filter holes. Both the distributor plate and the limiting perforated plate have small filter holes. When the distributor plate and the short perforated plate are attached, the large filter holes on the long sealing plate and the short perforated plate are not interconnected. That is, when the distributor plate and the short perforated plate are attached, the area where the other side has large filter holes is sealed by the area where the other side has large filter holes. When the long sealing plate and the limiting perforated plate are attached, the small filter holes on the distributor plate and the limiting perforated plate are not interconnected. The sealing principle of the long sealing plate and the limiting perforated plate is the same as that of the distributor plate and the short perforated plate.

[0014] In the above scheme, coarse material can pass through the large filter holes, while only qualified fluid can pass through the small filter holes. Therefore, the long sealing plate and the short orifice plate will not block the coarse material. Instead, the bottom of the distributor is raised by the sealing platform to form an isolation zone to store the coarse material that has passed through the large filter holes. When the long sealing plate rotates with the distributor plate, the inner side of the long sealing plate will not come into contact with the short orifice plate, so that position cannot be blocked, and therefore the large filter holes are not set.

[0015] Preferably, the housing includes a spherical surface and a narrow constricted surface. The middle part of the housing is a spherical surface, which is used to achieve better sealing of the isolation area. The two sides of the housing are narrow constricted surfaces. The diverter is located inside the spherical surface. The diameter of the diverter is larger than the diameter of the extruder output port to receive the impact generated by the fluid. At the same time, it can ensure sufficient resistance when it is located in a set position. In addition, the spherical surface has a larger space. When the fluid passes through the extruder output end and the narrow constricted surface, it will be accelerated. The fluid velocity will push the coarse material accumulated in the diverter forward. At this time, the large-diameter diverter can also receive the material without being pushed, thus achieving better force distribution.

[0016] Preferably, the drive assembly includes a force-bearing shaft, a spring, a slide groove, a sleeve rod, a half-disc, a push rod, and a torsion spring. The force-bearing shaft is slidably connected inside the housing. The spring is installed between the housing and the force-bearing shaft. The slide groove is located in the middle of the force-bearing shaft. One end of the sleeve rod is connected to the rotating shaft of the distribution plate, so that when the sleeve rod rotates, the distribution plate will also rotate synchronously to ensure uniform stability. The half-disc is connected to the other end of the sleeve rod. The outside of the push rod is slidably connected to the housing to ensure that the push rod has sufficient stability to support it. One end of the push rod is located inside the slide groove, and the other end of the push rod is in contact with the half-disc, so that the push rod is locked between the half-disc and the slide groove, thereby generating stable pushing and avoiding collisions between the three components to avoid instability caused by gaps. The torsion spring is installed between the sleeve rod and the housing.

[0017] In the above scheme, two reset drive structures, a spring and a torsion spring, are used to seal the leakage port when the diverter plate is quickly reset, preventing fluid from entering.

[0018] Preferably, the short perforated plate tilts upward as it moves away from the sealing platform. When the diverter plate is in the set position, the top of the limiting perforated plate is at the same height as the end of the long sealing plate near the diverter plate. This ensures that the isolation area is completely sealed and prevents fluid backflow, thus accommodating the gaps created by the tilting of the long sealing plate after rotation.

[0019] In the above solution, since some parts of the long sealing plate are equipped with large filter holes, material will accumulate. In order to clean it up, the material can slide down to a lower position by tilting the short perforated plate. When the long sealing plate rotates with the diverter plate, it will completely fit with the short perforated plate, and the tilt angles of the two will be the same, so the coarse material will fall back.

[0020] Preferably, the bottom of the limiting hole plate is connected to a convex shaft, and multiple convex shafts are provided. The front end of the convex shaft is chamfered to prevent collision when the diverter plate rotates. When the diverter plate is in contact with the limiting hole plate, the limiting hole plate penetrates the small filter hole of the diverter plate.

[0021] In the above solution, because the sealing plate is recessed downwards near the distribution plate, material accumulates and remains in the small filter holes of the distribution plate. The material in the small filter holes is pushed out by the convex shaft passing through the small filter holes of the distribution plate, which effectively increases the sealing and stability effect.

[0022] Preferably, the diversion plate includes a filter plate and a sealing plate. The sealing plate is connected to the bottom of the filter plate. The width of the sealing plate is twice the width of the discharge port, meaning that the discharge port gradually opens when the sealing plate rotates to half of the set position to prevent excessive fluid from entering. The side of the sealing plate away from the filter plate is an angled surface to ensure that when the sealing plate is in the set position, it roughly slides into the discharge port. The two sides of the sealing plate are shortened surfaces. When the sealing plate rotates, if the rotation angle rate between the two sides and the center position of the sealing plate is the same, the middle of the discharge port will open faster, resulting in a lack of synchronization and thus cutting off the two sides to ensure that the entire discharge port opens synchronously.

[0023] Preferably, when the distribution plate is in a vertical position, the large filter holes of the long sealing plate coincide with the axis of the large filter holes of the short perforated plate at the bottom, that is, the axis of the large filter holes of the long sealing plate and the short perforated plate coincides, so as to increase the flow rate of the fluid when the filter plate is in a vertical position. A straight groove is opened at the contact position between the short perforated plate and the sealing platform to reduce resistance and increase the flow rate. An extension plate is connected to the side of the long sealing plate away from the distribution plate to seal the straight groove.

[0024] Preferably, the chute includes a long side and a short side, the length of which is half the length of the long side, to shorten the driving distance and thus make the pushing faster. The increased pushing speed increases the rotation speed of the diverter plate and, in conjunction with the elongated sealing plate, quickly seals the isolation area. The front end of the push rod is a beveled end. After the pushing is completed, due to the two reset driving components, a spring and a torsion spring, the beveled end fully contacts the half-disc after the push rod is pushed, increasing friction and enhancing stability.

[0025] Preferably, the housing further includes a sleeve, the force-bearing shaft is located inside the sleeve, and a sealing sleeve is provided inside the sleeve. The length between the force-bearing shaft and the sealing sleeve is equal to the length of the short side to achieve sufficient thrust stability and prevent excessive thrust. An external protrusion is provided at the end of the force-bearing shaft away from the spring to increase the contact surface and quickly apply force to prevent insufficient pressure. Both the sleeve and the drive assembly are provided in twos and are symmetrical about the central axis of the distributor plate.

[0026] In the above scheme, the drive components on both sides of the distributor are used to quickly drive under pressure. At the same time, in order to prevent excessive extrusion pressure from causing collisions, a sealing sleeve is used for limiting. The sealing sleeve is also used to prevent fluid from entering the interior of the drive components, which would affect the drive operation and ensure smooth operation.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. The drive assembly rotates the distributor plate, changing the solution flow channel from a straight line to an upward slope. This increases the resistance inside the distributor, slows down the material flow rate inside the extruder, and achieves full material processing to reduce blockage. As the distributor plate rotates, the long sealing plate moves accordingly. The bottom of the distributor is closed while the shell is opened, which can separate and store accumulated impurities. This can effectively reduce the impact and wear on the screw. By separating coarse materials, the need to replace parts during peak production periods is reduced, which helps to reduce production line downtime, extend the screw's service life, and meet peak production demands.

[0029] 2. By utilizing two different types of filter holes—large and small—the material can flow normally without clogging. Accumulated material can pass through the large filter holes, allowing it to gradually accumulate downwards. To maximize material accumulation, the diameter of the distribution plate is larger than the output end of the extruder. The density of the small filter holes in the distribution plate is lower than that of conventional distribution components, increasing the flow velocity of the material upon entering the spherical surface. This allows for the storage of more fragmented material for accumulation and separation, which is then stored in a storage tank, preserving reusable material. By reusing this material, resources are saved, the need for new raw materials is reduced, and wear is minimized while preventing material waste.

[0030] 3. By using a chute to limit the movement of the push rod, and with the force shaft moving along the shorter side, the push rod's movement is accelerated. This allows the distributor plate to switch between vertical and set positions quickly, effectively preventing molten material from entering. Furthermore, the sealing plate is tilted in the set position, and its shortened surface allows coarse material to slide quickly into the discharge port, preventing it from stagnating, reducing the risk of equipment blockage, improving production continuity and reliability, and ensuring that coarse material does not remain inside the distributor, thus achieving complete separation of coarse material. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the vertical position of the flow divider plate of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure for setting the position of the diverter in this invention;

[0034] Figure 4 This is a schematic diagram of the structure of the current splitter of the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of the driving component of the present invention;

[0036] Figure 6 For the present invention Figure 2 An enlarged structural diagram at point A in the middle;

[0037] Figure 7 This is a schematic diagram of the structure of the sealing sheet of the present invention;

[0038] Figure 8 For the present invention Figure 4 An enlarged structural diagram at point B in the middle;

[0039] Figure 9 For the present invention Figure 5 An enlarged structural diagram of point C.

[0040] In the diagram: 1. Traction frame; 2. Extruder; 3. Die head; 4. Die head air ring; 5. Winding and cutting machine; 6. Diverter; 61. Housing; 611. Spherical surface; 612. Narrowing surface; 613. Sleeve; 613a. Sealing sleeve; 62. Material outlet; 63. Sealing platform; 64. Short perforated plate; 641. Straight groove; 65. Limiting perforated plate; 651. Convex shaft; 7. Diverter plate; 71. Filter plate; 72. Sealing plate ; 721, Angled surface; 722, Shortened surface; 8, Drive assembly; 81, Force-bearing shaft; 811, Outer protrusion; 82, Spring; 83, Slide groove; 831, Long side; 832, Short side; 84, Sleeve rod; 85, Half disc; 86, Push rod; 861, Angled end; 87, Torsion spring; 9, Long sealing plate; 91, Extension plate; 10, Bottom hopper; 11, Storage tank; r, Isolation zone; h, Large filter hole; s, Small filter hole. Detailed Implementation

[0041] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 9 This invention provides a system for preparing a biodegradable mulch film, the technical solution of which is as follows:

[0043] A biodegradable mulch film preparation system includes a traction frame 1, an extruder 2, a die head 3, a die head air ring 4, a winding and cutting machine 5, a distributor 6, a distributor plate 7, a drive assembly 8, a long sealing plate 9, a bottom hopper 10, and a storage tank 11. The extruder 2 is located on top of the traction frame 1, which is divided into a herringbone clamp, a traction assembly, and a frame. The die head 3 is located at the output end of the extruder 2. The die head air ring 4 is installed at the top of the die head 3 and consists of a die head and an air ring. The air ring is located at the top of the die head, and the material passes through the die head to reach the air ring for cooling. The distributor 6 connects the die head 3 and the extruder 2. The distributor 6 includes a housing 61 and a discharge port 62, which is located at the bottom end of the housing 61. The distributor plate 7 and the drive assembly 8 are both connected to the housing. Inside body 61, when the internal pressure of the distributor 6 exceeds the set value, the drive assembly 8 drives the distributor plate 7 to rotate counterclockwise to the set position. A long sealing plate 9 is fixedly installed on one side of the distributor plate 7. The area between the discharge port 62 and the long sealing plate 9 is the isolation zone r. When the distributor plate 7 is in the set position, the long sealing plate 9 and the distributor 6 cooperate to seal the isolation zone r. When the distributor plate 7 is in the vertical position, it closes the discharge port 62. When the distributor plate 7 rotates, the discharge port 62 gradually opens. That is, when the distributor plate 7 rotates, it drives the long sealing plate 9, which seals the isolation zone r. At the same time, the discharge port 62 gradually opens when the seal is halfway complete. The distributor plate 7 moves from the vertical position to the set position or resets relatively quickly, and the isolation zone r is in an unsealed state. The bottom chamber 10 is connected to the bottom end of the shell 61, and the top of the bottom chamber 10 is connected to the shell 61 through the discharge port 62. The storage tank 11 is placed inside the bottom chamber 10, that is, the top of the storage tank 11 has a slot for feeding. At the same time, a positioning structure is provided between the storage tank 11 and the bottom chamber 10 to ensure that the slot of the storage tank 11 is aligned with the discharge port 62 when it is inserted. The diverter plate 7 can rotate 20 degrees from the vertical position to the set position. At this time, the diverter plate 7 is at a 20-degree angle, which increases the resistance to a certain extent. At the same time, due to the inclination of the diverter plate 7, the material on its surface is more likely to slip off. The 20-degree rotation can effectively increase the rotation speed while meeting the sufficient separation requirements, thereby preventing fluid from entering. Temperatures below 20 degrees Celsius will result in insufficient resistance and reduce the space of the isolation zone r. Temperatures above 20 degrees Celsius will affect the rotation speed and cause excessive resistance. In addition, since the fluid is in a molten state and its flow is viscous, when attempting a simple filtration structure, the fluid will fill the space for storing coarse material and then remain stagnant, preventing other fluids and coarse material from entering. This makes filtration impossible using a water flow method. When separation is required, the fluid must be in a closed state. The shell 61 includes a spherical surface 611 and narrow constricted surfaces 612. The middle part of the shell 61 is the spherical surface 611, and the two sides of the shell 61 are narrow constricted surfaces 612. That is, the space for fluid flow goes from small to large and then back to small, causing the flow velocity to accelerate at the spherical surface 611, avoiding excessive resistance of the diverter 7 that would lead to insufficient flow velocity.Simultaneously, it can more quickly block coarse materials, and the flow rate can provide sufficient power to the drive component 8. The diverter plate 7 is located within the spherical surface 611, and the diameter of the diverter plate 7 is larger than the diameter of the extruder 2's output port. This is crucial during peak sales periods, as production failure to meet market demand can lead to lost sales opportunities. Preventative maintenance and equipment protection measures can reduce the probability of maintenance emergencies during peak periods, reduce the time and cost required for emergency repairs, prevent unprocessable materials from continuously remaining inside the extruder 2, help maintain the normal operation of the extruder, and avoid failures during peak periods, thus extending the overall lifespan of the equipment. Ensuring the equipment is operational when needed is paramount. Under high sales pressure, timely product delivery is crucial, which helps maintain customer relationships and increase market share.

[0044] As one embodiment of the present invention, refer to Figure 3-5 The distributor 6 also includes a sealing platform 63, a short perforated plate 64, and a limiting perforated plate 65. The sealing platform 63 and the limiting perforated plate 65 are connected inside the housing 61. The sealing platform 63 is located below the output end of the extruder 2. The short perforated plate 64 is connected to the top of the sealing platform 63. The short perforated plate 64 and the limiting perforated plate 65 are located on both sides of the distributor plate 7, that is, one side of the distributor plate 7 cooperates with the limiting perforated plate 65. The long sealing plate 9 cooperates with the short perforated plate 64 to achieve the sealing of the isolation zone r. Both the long sealing plate 9 and the short perforated plate 64 have large filter holes h. The side of the long sealing plate 9 closest to the distributor plate 7 does not have large filter holes h. Both the distributor plate 7 and the limiting perforated plate 65 have small filter holes s. When the disc 7 is attached to the short perforated plate 64, the long sealing plate 9 and the large filter holes h on the short perforated plate 64 are not connected. When the long sealing plate 9 is attached to the limiting perforated plate 65, the diverter disc 7 and the small filter holes s on the limiting perforated plate 65 are not connected. By utilizing the staggered positions of the holes when the components are attached, a sealing effect is achieved. As the short perforated plate 64 gradually moves away from the sealing platform 63, it tilts upward. At this time, the material at the top of the short perforated plate 64 will slide down due to the tilt. When the limiting perforated plate 65 is attached to the short perforated plate 64, it is also in a tilted state, allowing the material to accumulate on the top of the sealing platform 63. When the diverter disc 7 is in the set position, the top of the limiting perforated plate 65 is at the same height as the end of the long sealing plate 9 near the diverter disc 7.

[0045] As one embodiment of the present invention, refer to Figure 5-9The drive assembly 8 includes a force-bearing shaft 81, a spring 82, a slide groove 83, a sleeve 84, a half-disc 85, a push rod 86, and a torsion spring 87. The force-bearing shaft 81 is slidably connected inside the housing 61. The spring 82 is installed between the housing 61 and the force-bearing shaft 81. The slide groove 83 is formed in the middle of the force-bearing shaft 81. One end of the sleeve 84 is connected to the rotating shaft of the diverter plate 7. When the sleeve 84 moves, the diverter plate 7 moves synchronously, and the rotation angles of the two are the same. That is, when the sleeve 84 rotates twenty degrees, the diverter plate 7 also rotates twenty degrees. The half-disc 85 is connected to the other end of the sleeve 84. The outside of the push rod 86 is connected to the housing 61. 1. Sliding connection: one end of push rod 86 is located inside slide groove 83, and the other end of push rod 86 is in contact with half disc 85. Push rod 86 is always between slide groove 83 and half disc 85. Torsion spring 87 is installed between sleeve rod 84 and housing 61. Housing 61 also includes sleeve 613. Force shaft 81 is located inside sleeve 613. The end of force shaft 81 away from spring 82 is provided with an external protrusion 811. Sleeve 613 and drive assembly 8 are both provided with two and are symmetrical about the central axis of diverter 7 to prevent the pressure generated inside diverter 6 from not being received quickly. Receiving components are added on both sides and inside.

[0046] As one embodiment of the present invention, refer to Figure 6 The bottom of the limiting orifice plate 65 is connected to a convex shaft 651. Multiple convex shafts 651 are provided. The front end of the convex shaft 651 is chamfered. When the diverter plate 7 is in contact with the limiting orifice plate 65, the limiting orifice plate 65 penetrates the small filter hole s of the diverter plate 7. That is, the diameter of the convex shaft 651 is the same as that of the small filter hole s. At the same time, the convex shaft 651 is located at a low position to clean the material accumulated at the bottom without affecting the flow of fluid.

[0047] As one embodiment of the present invention, refer to Figure 7 The diversion plate 7 includes a filter plate 71 and a sealing plate 72. The sealing plate 72 is connected to the bottom of the filter plate 71. The width of the sealing plate 72 is twice the width of the discharge port 62. That is, when the sealing plate 72 rotates, the discharge port 62 will not open immediately, and when the sealing plate 72 is reset, the discharge port 62 will immediately enter the closed state, which effectively prevents the waste of fluid materials. Storing coarse materials helps to save resources and reduce costs. The side of the sealing plate 72 away from the filter plate 71 is an angled surface 721, and the two sides of the sealing plate 72 are shortened surfaces 722.

[0048] As one embodiment of the present invention, refer to Figure 8When the diverter plate 7 is in a vertical position, the large filter holes h on the long sealing plate 9 and the large filter holes h on the short perforated plate 64 at the bottom coincide to reduce cross-linking and avoid resistance. When they are in contact, the large filter holes h will not contact each other to ensure a seal. A straight groove 641 is provided at the contact position between the short perforated plate 64 and the sealing platform 63, so that the flow rate at this position is faster and can push the coarse material accumulated on the top of the sealing platform 63 into the isolation zone r. An extension plate 91 is connected to the side of the long sealing plate 9 away from the diverter plate 7 to seal the straight groove 641.

[0049] As one embodiment of the present invention, refer to Figure 9 A biodegradable mulch film preparation system includes a chute 83 comprising a long side 831 and a short side 832, the length of which is half the length of the long side 831. When the push rod 86 moves from one point on the short side 832 to another, the half-disc 85 moves according to the path change of the chute 83, shortening the distance of the short side 832, thus shortening the moving distance of the force-bearing axis 81, increasing the moving speed of the push rod 86, and using the push rod 86 to push the half-disc 85 faster. The casing 613... An internal sealing sleeve 613a is provided. The length between the force-bearing shaft 81 and the sealing sleeve 613a is equal to the length of the short side 832, which cooperates with the push rod 86 to increase the stability of the seal. The front end of the push rod 86 is a beveled end 861. Since one end of the push rod 86 will contact the half-disc 85 in any state, and the push rod 86 is in an inclined state when it generates a thrust to push the half-disc 85, in order to ensure sufficient stability, the beveled end 861 is at the same inclination angle as the half-disc 85 to increase the contact surface.

[0050] Working principle: Raw material granules are fed into the feed inlet of extruder 2. Extruder 2 is externally heated and internally rotated. The screw melts the plastic granules into a molten fluid. When wear gaps appear inside extruder 2, material passes through the gaps without entering the molten state; this is coarse material. The molten fluid and coarse material reach the inside of distributor 6 and are separated by distributor plate 7. The coarse material is blocked and gradually accumulates and slides down, causing distributor 6 to become blocked. At this time, the internal flow pressure increases and reaches a set value, impacting the surrounding area and causing the force shaft 81 to slide rapidly. Due to the sliding of the force shaft 81, the push rod 86 is squeezed inside the slide groove 83. At this time, the push rod 86 will quickly... The rapid movement of the half-disc 85 generates thrust, causing the half-disc 85 to rotate and drive the filter disc 71 to rotate. The rotation of the filter disc 71 causes the elongated sealing plate 9 and sealing sheet 72 to rotate synchronously. When the diverting disc 7 reaches its set position, the discharge port 62 fully opens. At this point, the elongated sealing plate 9 completely adheres to the short perforated plate 64, forming a seal, while the filter disc 71 adheres to the limiting perforated plate 65, forming a seal. This completely seals the isolation zone r, allowing the accumulated coarse material to gradually slide from the discharge port 62 into the bottom hopper 10 and be stored in the storage tank 11. Simultaneously, the rotation of the diverting disc 7 increases fluid resistance, reducing the fluid velocity inside the extruder 2 and decreasing the leakage flow. Furthermore, the material at the top of the elongated sealing plate 9 will slide down due to the tilt, thereby reducing the internal pressure of the distributor 6. When the pressure decreases, the spring 82 quickly pushes the force shaft 81 back to its original position, and at the same time, the torsion spring 87 causes the distributor plate 7 and the half plate 85 to reset. The half plate 85 will also reset simultaneously with the push rod 86. The coarse material will pass through the large filter hole h or stay above the elongated sealing plate 9 due to the action of fluid and gravity, and then accumulate again for repeated unloading. The storage tank 11 only needs to be disassembled once a week for storage and reuse. The molten fluid is extruded through the distributor plate 7 to the die head 3. After passing through the die head 3, it passes through the specially structured die head air ring 4 to form a... The film is rapidly cooled and solidified by the die head air ring 4. Simultaneously, the air compression device inside the die head air ring 4 inflates the film with airflow to achieve the required width and thickness. The film is then moved upwards, and the speed and traction direction of the film are controlled by the herringbone frame extrusion and traction components inside the traction frame 1, which work in conjunction with the air ring die head to achieve the required flatness and stretch ratio. The product is then wound onto the take-up and cutter 5. The take-up and cutter 5 uses a winding roller with a constant speed to wind the film product into a roll. At the same time, it can be further cut as needed. The completed film rolls need to be packaged to protect the product from contamination before distribution and transportation.

[0051] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. All equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this invention belong to existing technology known to those skilled in the art.

Claims

1. A system for preparing a biodegradable mulch film, comprising a traction frame (1), an extruder (2), a die head (3), a die head air ring (4), and a winding and cutting machine (5), wherein the extruder (2) is disposed on the top of the traction frame (1), the die head (3) is disposed at the output end of the extruder (2), and the die head air ring (4) is mounted on the top of the die head (3), characterized in that, It also includes a distributor (6), a distributor plate (7), a drive assembly (8), a long sealing plate (9), a bottom chamber (10), and a storage tank (11). The distributor (6) is connected between the die head (3) and the extruder (2). The distributor (6) includes a housing (61) and a discharge port (62). The discharge port (62) is located at the bottom of the housing (61). The distributor plate (7) and the drive assembly (8) are both connected inside the housing (61). When the internal pressure of the distributor (6) exceeds a set value, the drive assembly (8) drives the distributor plate (7) to rotate counterclockwise to the set position. A long sealing plate (9) is fixedly installed on one side. The material leakage port (62) and the long sealing plate (9) form an isolation zone (r). When the diverting plate (7) is in the set position, it cooperates with the long sealing plate (9) and the diverter (6) to seal the isolation zone (r). When the diverting plate (7) is in the vertical position, it closes the material leakage port (62). When the diverting plate (7) rotates, the material leakage port (62) gradually opens. The bottom chamber (10) is connected to the bottom end of the shell (61). The top of the bottom chamber (10) is connected to the shell (61) through the material leakage port (62). The storage tank (11) is placed inside the bottom chamber (10).

2. The system for preparing a biodegradable mulch film according to claim 1, characterized in that: The distributor (6) further includes a sealing platform (63), a short perforated plate (64), and a limiting perforated plate (65). The sealing platform (63) and the limiting perforated plate (65) are connected inside the housing (61). The sealing platform (63) is located below the output end of the extruder (2). The short perforated plate (64) is connected to the top of the sealing platform (63). The short perforated plate (64) and the limiting perforated plate (65) are located on both sides of the distributor plate (7). The long sealing plate (9) is connected to the short perforated plate (64). All are provided with large filter holes (h). The long sealing plate (9) does not have large filter holes (h) on the side near the diverter plate (7). Small filter holes (s) are provided on both the diverter plate (7) and the limiting hole plate (65). When the diverter plate (7) and the short hole plate (64) are attached, the large filter holes (h) on the long sealing plate (9) and the short hole plate (64) are not connected to each other. When the long sealing plate (9) and the limiting hole plate (65) are attached, the small filter holes (s) on the diverter plate (7) and the limiting hole plate (65) are not connected to each other.

3. The system for preparing a biodegradable mulch film according to claim 2, characterized in that: The housing (61) includes a spherical surface (611) and a narrowed surface (612). The middle part of the housing (61) is the spherical surface (611), and the two sides of the housing (61) are narrowed surfaces (612). The diverter plate (7) is located inside the spherical surface (611), and the diameter of the diverter plate (7) is larger than the diameter of the outlet of the extruder (2).

4. The system for preparing a biodegradable mulch film according to claim 2, characterized in that: The drive assembly (8) includes a force-bearing shaft (81), a spring (82), a groove (83), a sleeve (84), a half-disc (85), a push rod (86), and a torsion spring (87). The force-bearing shaft (81) is slidably connected inside the housing (61). The spring (82) is installed between the housing (61) and the force-bearing shaft (81). The groove (83) is opened in the middle of the force-bearing shaft (81). One end of the sleeve (84) is connected to the rotating shaft of the diverter plate (7). The half-disc (85) is connected to the other end of the sleeve (84). The outside of the push rod (86) is slidably connected to the housing (61). One end of the push rod (86) is located inside the groove (83). The other end of the push rod (86) is in contact with the half-disc (85). The torsion spring (87) is installed between the sleeve (84) and the housing (61).

5. The system for preparing a biodegradable mulch film according to claim 2, characterized in that: The short perforated plate (64) tilts upward as it moves away from the closed platform (63). When the diverter plate (7) is in the set position, the top of the limiting perforated plate (65) is at the same height as the end of the long sealing plate (9) near the diverter plate (7).

6. The system for preparing a biodegradable mulch film according to claim 5, characterized in that: The bottom of the limiting hole plate (65) is connected to a convex shaft (651), and multiple convex shafts (651) are provided. The front end of the convex shaft (651) is chamfered. When the diverter plate (7) is in contact with the limiting hole plate (65), the limiting hole plate (65) penetrates the small filter hole (s) of the diverter plate (7).

7. The biodegradable mulch film preparation system according to claim 4, characterized in that: The diversion plate (7) includes a filter plate (71) and a sealing plate (72). The sealing plate (72) is connected to the bottom of the filter plate (71). The width of the sealing plate (72) is twice the width of the discharge port (62). The side of the sealing plate (72) away from the filter plate (71) is an angled surface (721), and the two sides of the sealing plate (72) are shortened surfaces (722).

8. The system for preparing a biodegradable mulch film according to claim 2, characterized in that: When the diverter plate (7) is in a vertical position, the large filter hole (h) of the long sealing plate (9) coincides with the axis of the large filter hole (h) on the short perforated plate (64) at the bottom. A straight groove (641) is provided at the contact position between the short perforated plate (64) and the sealing platform (63). An extension plate (91) is connected to the side of the long sealing plate (9) away from the diverter plate (7).

9. The system for preparing a biodegradable mulch film according to claim 4, characterized in that: The groove (83) includes a long side (831) and a short side (832), the length of the short side (832) is half the length of the long side (831), and the front end of the push rod (86) is an inclined end (861).

10. The system for preparing a biodegradable mulch film according to claim 2, characterized in that: The housing (61) also includes a sleeve (613), the force-bearing shaft (81) is located inside the sleeve (613), the sleeve (613) is provided with a sealing sleeve (613a), the length between the force-bearing shaft (81) and the sealing sleeve (613a) is equal to the length of the short side (832), the end of the force-bearing shaft (81) away from the spring (82) is provided with an external protrusion (811), the sleeve (613) and the drive assembly (8) are both provided with two and are symmetrical about the central axis of the diverter plate (7).

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