Preparation method and application of environmentally friendly biodegradable film for high-standard farmland

Abstract

The invention provides a preparation method and application of an environmentally friendly biodegradable film used for high-standard farmland, relates to the technical field of degradable films, and comprises the following steps: preparing cotton stalk powder; taking target weight portions of high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, cotton stalk powder, modified starch, dispersant, plasticizer and surfactant, and putting the above materials into a stirring mechanism and mixing them evenly to obtain a mixed material; putting the mixed material obtained in step 2 into an extrusion mechanism for melt extrusion to obtain a degradable film; and winding the degradable film through an anti-loose winding mechanism; the anti-loose winding mechanism can prevent bubbles from appearing in the degradable film during the winding process, resulting in the degradable film being easily loose after being rolled, thereby solving the technical problem that bubbles are easily formed in the degradable film after being rolled if the existing degradable film is only wound by a winding roller during the production and rolling process, and the degradable film is easily loose after being rolled.

Description

Technical Field

[0001] The present invention relates to the technical field of degradable films, and in particular to a method for preparing an environmentally friendly biodegradable film used for high-standard farmland and its application. Background Art

[0002] Film materials are widely used in the fields of medicine, packaging, chemical industry, agriculture, etc. due to their stable performance, low price, and easy use. Agricultural film is an important agricultural production material after seeds, fertilizers, and pesticides. Its application has brought a revolution to agricultural production and made important contributions to agricultural efficiency and farmers' income. Agricultural film is now widely used as covering material for solar greenhouses, vegetable greenhouses, and ground cover planting. It mainly includes greenhouse film and ground film, forage film, shade net, insect-proof net, etc.

[0003] Most modern agricultural covering materials are petroleum-based products. Due to their large relative molecular weight, strong hydrophobicity, and stable molecular bonds, they usually take 100 to 200 years or even longer to degrade in nature. Compared with the recycling of waste film materials, using degradable films to replace traditional non-degradable films has become an effective measure to alleviate the pollution of waste film materials;

[0004] However, if the existing degradable film is rolled up only by a winding roller during the production and rolling process, bubbles are likely to appear in the rolled degradable film, and the rolled degradable film is likely to become loose. Summary of the invention

[0005] The present invention provides a method for preparing an environmentally friendly biodegradable film for high-standard farmland and its application, so as to solve the technical problem that bubbles are easily formed in the rolled degradable film and the rolled degradable film is easily loosened if the existing degradable film is rolled only by a winding roller during the production and rolling process.

[0006] In order to solve the above technical problems, the present invention discloses a method for preparing an environmentally friendly biodegradable film for high-standard farmland and its application, comprising the following steps:

[0007] Step 1: preparing cotton stalk fine powder;

[0008] Step 2: taking target weight portions of high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, cotton stalk powder, modified starch, dispersant, plasticizer and surfactant and putting the above materials into a stirring mechanism and mixing them evenly to obtain a mixed material;

[0009] Step 3: putting the mixed material obtained in step 2 into an extrusion mechanism for melt extrusion to obtain a degradable film;

[0010] Step 4: Roll up the degradable film through the anti-loosening winding mechanism.

[0011] Preferably, the specific steps of step 1 are:

[0012] Step 11: taking a certain amount of cotton stalks and a modifier in a weight ratio of 100:3 to 11;

[0013] Step 12: Crush the cotton stalks to 0.5 mm to 1.5 mm, then add the modifier and stir at room temperature for 3 h to 4 h.

[0014] Preferably, the weight ratio of high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, cotton stalk powder, modified starch, dispersant, plasticizer and surfactant is 10-15:22-34:5-10:2-7:23-37:12-22:4-9:1-5:1-3.

[0015] Preferably, the stirring mechanism includes a stirring shell, a crushing chamber is provided inside the left upper end of the stirring shell, a feeding chamber is provided inside the right upper end of the stirring shell, a mixing chamber is provided inside the lower end of the stirring shell, the crushing chamber is connected with the mixing chamber through a feeding port, a blocking plate is rotatably provided in the feeding port, a crushing rod is rotatably provided in the crushing chamber, the cylindrical section of the crushing rod passes through the upper end of the crushing chamber and is fixedly connected to motor three, a stirring rod is rotatably provided in the mixing chamber, the stirring rod passes through the upper end of the mixing chamber and is fixedly connected to motor two, and motors two and three are both installed on the stirring shell.

[0016] Preferably, a metering mechanism is provided in the feeding chamber and the feeding port, the metering mechanism comprises a placing plate 1 slidably arranged in the feeding port and a placing plate 2 slidably arranged in the feeding chamber, a discharge port is penetrated through the middle of the placing plate 1 and the placing plate 2, the inclined ends on the left and right sides of the placing plate 1 and the placing plate 2 are inclined toward the discharge port, a rotating shaft is provided at the side end of the discharge port, the rotating shaft is fixedly connected to the baffle plate, the rotating shaft is connected through a driving mechanism 1, the driving mechanism 1 is arranged in the placing plate 1 and the placing plate 2, the driving mechanism 1 comprises a pulley 1, a connecting belt, a pulley 2 and a driving motor, the pulley 1 is fixedly connected to the rotating shaft, the pulley 2 is fixedly connected to the driving motor, and the pulley 1 is connected to the pulley 2 through the connecting belt.

[0017] Preferably, the lower end of the placement plate one is fixedly connected to the fixing rod one, the fixing rod one penetrates the upper end of the sealing chamber one into the sealing chamber one and is fixedly connected to the sealing plate one, the sealing plate one is slidably connected to the sealing chamber one, and a spring rod one is fixedly provided between the sealing plate one and the sealing chamber one, the sealing chamber one is arranged at the side end of the feeding port, the lower end of the placement plate two is fixedly connected to the fixing rod two, the fixing rod two penetrates the upper end of the sealing chamber two into the sealing chamber two and is fixedly connected to the sealing plate two, the sealing plate two is slidably connected to the sealing chamber two, and a spring rod two is fixedly provided between the sealing plate two and the sealing chamber two, and the sealing chamber two is arranged at the side end of the feeding chamber.

[0018] Preferably, air pressure detector 1 is provided in sealed cavity 1, and air pressure detector 2 is provided in sealed cavity 2. Air pressure detector 1 is electrically connected to the driving motor in placement plate 1 through controller 1, and air pressure detector 2 is electrically connected to the driving motor in placement plate 2 through controller 2.

[0019] Preferably, the extrusion mechanism includes an extrusion shell, which is mounted on a bracket, an extrusion cavity is provided inside the extrusion shell, a threaded extrusion rod is rotatably provided in the extrusion cavity, a cylindrical section of the threaded extrusion rod passes through the left end of the extrusion shell and is fixedly connected to a motor, and the motor is fixedly arranged at the left end of the extrusion shell, an inlet is provided at the upper end of the extrusion shell, a baffle is rotatably provided in the inlet, the extrusion cavity is connected with the mixing cavity through the inlet, a die head is installed at the right end outlet of the extrusion cavity, an insulation shell is provided on the right side of the extrusion shell, a plurality of heaters are provided inside the insulation shell, and the plurality of heaters are installed on the extrusion shell, a water outlet pipe is provided in the middle part of the lower end of the extrusion shell, a collecting shell is correspondingly provided at the lower end of the water outlet pipe, and the collecting shell is fixedly connected to the bracket.

[0020] Preferably, the anti-loosening winding mechanism includes a fixing plate, the fixing plate is fixedly connected to the bracket, a support rod 1 is symmetrically provided on the front and rear sides of the upper left part of the fixing plate, a tensioning wheel is rotatably provided between the support rods 1 on the front and rear sides, a support rod 2 is symmetrically provided on the front and rear sides of the middle part of the upper end of the fixing plate, a guide wheel 1 is rotatably provided between the upper parts of the support rods 2 on the front and rear sides, a sliding cavity 1 is slidably provided on the lower side of the support rod 2, a support block 1 is slidably provided in the sliding cavity 1, a connecting shaft 1 is fixedly provided between the support blocks 1 on the front and rear sides, the connecting shaft 1 is rotatably connected to the guide wheel 2, the connecting shaft 1 passes through the front end of the front sliding cavity 1 and is connected to the elastic The spring rod three is fixedly connected, the lower inclined end of the spring rod three is slidably connected to the left inclined end of the matching block, the right inclined end of the matching block is slidably connected to the inclined end of the connecting rod, and support rods three are symmetrically provided on the front and rear sides of the upper right part of the fixed plate, and a sliding cavity two is slidingly provided on the upper side of the support rod three, and the sliding cavity two is tilted, and a support block two is slidingly provided in the sliding cavity two, and a connecting shaft two is rotatably provided between the support blocks two on the front and rear sides, and the connecting shaft two is fixedly connected to the winding wheel, and the connecting shaft two passes through the front end of the support block two and is rotatably connected to the connecting rod and fixedly connected to the working motor, and the working motor is fixedly connected to the connecting rod.

[0021] A method for preparing an environmentally friendly biodegradable film for high-standard farmland. The prepared environmentally friendly biodegradable film for high-standard farmland is used in farmland planting.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the process flow of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the stirring mechanism, extrusion mechanism and anti-loosening winding mechanism of the present invention;

[0026] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of region A;

[0027] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of area B.

[0028] In the figure: 1. extrusion shell; 2. bracket; 3. motor 1; 4. extrusion chamber; 5. threaded extrusion rod; 6. motor 2; 7. winding wheel; 8. support block 2; 9. sliding chamber 2; 10. connecting rod; 11. matching block; 12. spring rod 3; 13. support block 1; 14. sliding chamber 1; 15. guide wheel 2; 16. guide wheel 1; 17. crushing rod; 18. stirring shell; 19. crushing chamber; 20. mixing chamber; 21. degradable film; 22. feeding port; 23. placement plate 1; 24. fixing rod 1 ; 25. Sealing chamber one; 26. Sealing plate two; 27. Sealing chamber two; 28. Fixed rod two; 29. ​​Feeding chamber; 30. Placing plate two; 31. Discharge port; 32. Baffle plate; 33. Rotating shaft; 34. Connecting belt; 35. Pulley two; 36. Driving motor; 37. Inlet; 38. Baffle; 39. Motor three; 40. Support rod two; 41. Tensioning wheel; 42. Stirring rod; 43. Water outlet pipe; 44. Collecting shell; 45. Heater; 46. Die head; 47. Fixed plate; 48. Blocking plate. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides the following embodiments

[0032] Example 1

[0033] The embodiment of the present invention provides a method for preparing an environmentally friendly biodegradable film used in high-standard farmland, such as Figure 1 As shown, the following steps are included:

[0034] Step 1: preparing cotton stalk fine powder;

[0035] Step 2: taking target weight portions of high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, cotton stalk powder, modified starch, dispersant, plasticizer and surfactant and putting the above materials into a stirring mechanism and mixing them evenly to obtain a mixed material;

[0036] Step 3: putting the mixed material obtained in step 2 into an extrusion mechanism for melt extrusion to obtain a degradable film 21;

[0037] Step 4: Rolling up the degradable film 21 through the anti-loosening winding mechanism;

[0038] The specific steps of step 1 are:

[0039] Step 11: taking a certain amount of cotton stalks and a modifier in a weight ratio of 100:3 to 11;

[0040] Step 12: Crush the cotton stalks to 0.5 mm to 1.5 mm, then add the modifier and stir at room temperature for 3 h to 4 h;

[0041] The weight ratio of high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, cotton stalk powder, modified starch, dispersant, plasticizer and surfactant is 10-15:22-34:5-10:2-7:23-37:12-22:4-9:1-5:1-3.

[0042] The beneficial effects of the above technical solution are:

[0043] The modifier comprises a silane coupling agent, paraffin wax and acrylic acid, and the weight ratio of the silane coupling agent, paraffin wax and acrylic acid is 1-5:1:0.1-0.3; the plasticizer is selected from a polyol having 3-8 carbon atoms; the modified starch is an enzymatic modified starch, and the modified starch is any one of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, maltodextrin and straight-chain starch; the dispersant is any one of stearic acid, oleamide, erucamide and calcium stearate; and the surfactant is a compound of sodium cocoyl isethionate, sodium lauryl glucose carboxylate and cocamidopropyl betaine;

[0044] The cotton stalk powder is modified to increase its hydrophobicity, improve its compatibility with high-density polyethylene, low-density polyethylene, polylactic acid, and polyglycolide, and improve the light transmittance, mechanical properties, and waterproof properties of the produced degradable film 21. By adding a modifier and using a polyol with 3 to 8 carbon atoms as a plasticizer, the brittle temperature of the degradable film can be reduced and the plasticity of the degradable film 21 can be increased. The surfactant can improve the ductility of the degradable film 21 and reduce the water vapor permeability of the degradable film 21. The anti-loose winding mechanism can prevent the degradable film 21 from having bubbles during the winding process, which makes the degradable film 21 loose after winding. This solves the technical problem that bubbles are easily formed in the degradable film after rolling if the existing degradable film is only wound by a winding roller during the production and winding process, and the degradable film is easily loose after rolling.

[0045] Example 2

[0046] On the basis of Example 1, Figure 1-Figure 4 As shown, the stirring mechanism includes a stirring shell 18, a crushing chamber 19 is provided inside the left side of the upper end of the stirring shell 18, a feeding chamber 29 is provided inside the right side of the upper end of the stirring shell 18, a mixing chamber 20 is provided inside the lower end of the stirring shell 18, the crushing chamber 19 is communicated with the mixing chamber 20 through a feeding port 22, a blocking plate 48 is rotatably provided in the feeding port 22, a crushing rod 17 is rotatably provided in the crushing chamber 19, a cylindrical section of the crushing rod 17 penetrates the upper end of the crushing chamber 19 and is fixedly connected to a motor three 39, a stirring rod 42 is rotatably provided in the mixing chamber 20, the stirring rod 42 penetrates the upper end of the mixing chamber 20 and is fixedly connected to a motor two 6, and both the motor two 6 and the motor three 39 are installed on the stirring shell 18;

[0047] The feeding chamber 29 and the feeding port 22 are both provided with metering mechanisms, which include a placement plate 23 slidably arranged in the feeding port 22 and a placement plate 2 30 slidably arranged in the feeding chamber 29, and a discharge port 31 is penetrated in the middle of the placement plate 23 and the placement plate 2 30, and the inclined ends on the left and right sides of the placement plate 23 and the placement plate 2 30 are inclined toward the discharge port 31, and a rotating shaft 33 is provided at the side end of the discharge port 31, and the rotating shaft 33 is fixedly connected to the baffle plate 32, and the rotating shaft 33 is connected through a driving mechanism 1, and the driving mechanism 1 is arranged in the placement plate 1 23 and the placement plate 2 30, and the driving mechanism 1 includes a pulley 1, a connecting belt 34, a pulley 2 35 and a driving motor 36, the pulley 1 is fixedly connected to the rotating shaft 33, the pulley 2 35 is fixedly connected to the driving motor 36, and the pulley 1 is connected to the pulley 2 35 through the connecting belt 34;

[0048] The lower end of the placement plate 1 23 is fixedly connected to the fixing rod 1 24, the fixing rod 1 24 penetrates the upper end of the sealing chamber 1 25 into the sealing chamber 1 25 and is fixedly connected to the sealing plate 1, the sealing plate 1 is slidably connected to the sealing chamber 1 25, and a spring rod 1 is fixedly arranged between the sealing plate 1 and the sealing chamber 1 25, the sealing chamber 1 25 is arranged at the side end of the feeding port 22, the lower end of the placement plate 2 30 is fixedly connected to the fixing rod 2 28, the fixing rod 28 penetrates the upper end of the sealing chamber 27 into the sealing chamber 27 and is fixedly connected to the sealing plate 26, the sealing plate 26 is slidably connected to the sealing chamber 27, and a spring rod 2 is fixedly arranged between the sealing plate 26 and the sealing chamber 27, the sealing chamber 27 is arranged at the side end of the feeding chamber 29;

[0049] An air pressure detector 1 is provided in the sealed chamber 1 25, and an air pressure detector 2 is provided in the sealed chamber 27. The air pressure detector 1 is electrically connected to the driving motor 36 in the placement plate 1 23 through the controller 1, and the air pressure detector 2 is electrically connected to the driving motor 36 in the placement plate 2 30 through the controller 2.

[0050] The beneficial effects of the above technical solution are:

[0051] A feeding port is provided at the side end of the crushing chamber 19 for adding modifiers and cotton stalks. First, a target amount of cotton stalks is added to the crushing chamber 19 through the feeding port. When the motor 39 is working, the crushing rod 17 is driven to work. The crushing rod 17 is used to crush the cotton stalks to 0.5 mm to 1.5 mm. Then, a target amount of modifier is added to the crushing chamber 19 through the feeding port. The crushing rod 17 is used to stir the crushed cotton stalks and the modifier in the crushing chamber 19 so that the crushed cotton stalks and the modifier are evenly mixed. A sufficient amount of cotton stalk fine powder is prepared in the crushing chamber 19. When the motor 2 6 is working, the stirring rod 42 is driven to rotate. The stirring rod 42 drives the high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, cotton stalk fine powder, modified starch, dispersant, plasticizer and surfactant added to the mixing chamber 20 to mix evenly.

[0052] A mixture of high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, modified starch, dispersant, plasticizer and surfactant in target weight portions is added through the feeding chamber 29. Under the action of gravity of the mixture, the placing plate 2 30 is driven to start working. The placing plate 2 30 drives the fixing rod 28 to move downward. The fixing rod 28 drives the sealing plate 26 to slide along the sealing chamber 27. The spring rod 2 is compressed, which drives the air pressure in the sealing chamber 27 to change. The air pressure detector 2 is used to detect the air pressure value in the sealing chamber 27. The weight of the mixture on the placing plate 2 30 is the product of the detection value of the air pressure detector 2 and the cross-sectional area of ​​the sealing plate 26. The target detection value (specific weight) of the air pressure detector 1 is calculated according to the weight ratio of the cotton stalk fine powder and the mixture. The volume calculation formula is P*S*K / A, where P is the detection value of the air pressure detector 2, S is the cross-sectional area of ​​the sealing plate 26, K is the weight ratio of the cotton stalk powder and the mixture, and A is the cross-sectional area of ​​the sealing plate 1). When it is necessary to add cotton stalk powder, open the blocking plate 48, so that the cotton stalk powder in the crushing chamber 19 falls on the placing plate 23, and the placing plate 23 drives the fixing rod 24 to move downward, and the fixing rod 24 drives the sealing plate 1 to slide along the sealing chamber 25, the spring rod 1 is compressed, and the air pressure in the sealing chamber 25 changes. The air pressure detector 1 is used to detect the air pressure in the sealing chamber 25. After the detection value of the air pressure detector 1 reaches the target detection value, the blocking plate 48 is closed, so that the crushing chamber 19 no longer adds cotton stalk powder to the feeding port 22;

[0053] The air pressure detector 1 controls the driving motor 36 in the placing plate 1 23 to work through the controller 1, and the air pressure detector 2 controls the driving motor 36 in the placing plate 2 30 to work through the controller 2. The driving motor 36 drives the rotating shaft 33 to rotate through the pulley 2, the connecting belt 34 and the pulley 1, so that the baffle plate 32 rotates and the discharge port 31 is opened, so that the cotton stalk powder and the mixture enter the mixing chamber 20 through the discharge port 31 for uniform mixing. After the feeding is completed, the placing plate 1 23 and the placing plate 2 30 return to their original positions under the elastic action of the spring rod 1 and the spring rod 2. And make the driving motor 36 work in reverse, make the baffle plate 32 return to its original position, and re-block the discharge port 31. The inclined ends on the left and right sides of the placement plate 1 23 and the placement plate 2 30 are set to facilitate the cotton stalk fine powder and the mixture to flow to the discharge port 31. By setting up a stirring mechanism, cotton stalk fine powder can be produced. By setting up a metering mechanism, a target amount of cotton stalk fine powder can be automatically added from the stirring mechanism according to the weight of the mixture added to the feeding chamber 29. There is no need to manually weigh the target amount of cotton stalk fine powder after the cotton stalk fine powder is produced, which saves time and effort and improves the production efficiency of the degradable film.

[0054] Example 3

[0055] On the basis of Example 2, Figure 1-Figure 4As shown, the extrusion mechanism includes an extrusion shell 1, which is mounted on a bracket 2. An extrusion chamber 4 is provided inside the extrusion shell 1, in which a threaded extrusion rod 5 is rotatably provided. The cylindrical section of the threaded extrusion rod 5 passes through the left end of the extrusion shell 1 and is fixedly connected to a motor 3. The motor 3 is fixedly arranged at the left end of the extrusion shell 1. An inlet 37 is provided at the upper end of the extrusion shell 1, in which a baffle 38 is rotatably provided. The extrusion chamber 4 is connected to the mixing chamber 20 through the inlet 37. A die head 46 is installed at the right end outlet of the extrusion chamber 4. An insulation shell is provided on the right side of the extrusion shell 1. A plurality of heaters 45 are provided inside the insulation shell. The plurality of heaters 45 are installed on the extrusion shell 1. A water outlet pipe 43 is provided in the middle part of the lower end of the extrusion shell 1. A collecting shell 44 is correspondingly provided at the lower end of the water outlet pipe 43. The collecting shell 44 is fixedly connected to the bracket 2.

[0056] The beneficial effects of the above technical solution are:

[0057] The heater 45 is set to heat the temperature in the extrusion chamber 4 to the target temperature, which can be 145°C. The baffle 38 is opened to allow the mixture containing high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, cotton stalk powder, modified starch, dispersant, plasticizer and surfactant that is evenly mixed in the mixing chamber 20 to fall into the extrusion chamber 4, and the motor 3 is controlled to work. The motor 3 drives the threaded extrusion rod 5 to work. When the threaded extrusion rod 5 rotates, the mixed material is melted and extruded into the die head 46 for molding, forming a degradable film 21. In this process, the extruded water is discharged into the collection shell 44 through the outlet pipe 43.

[0058] Example 4

[0059] On the basis of Example 3, Figure 1-Figure 4As shown, the anti-loosening winding mechanism includes a fixing plate 47, which is fixedly connected to the bracket 2, and a support rod 1 is symmetrically provided on the front and rear sides of the upper left part of the fixing plate 47, and a tensioning wheel 41 is rotatably provided between the support rods 1 on the front and rear sides, and a support rod 2 40 is symmetrically provided on the front and rear sides of the middle part of the upper end of the fixing plate 47, and a guide wheel 16 is rotatably provided between the upper parts of the support rods 2 40 on the front and rear sides, and a sliding cavity 14 is slidably provided on the lower side of the support rod 2 40, and a support block 13 is slidably provided in the sliding cavity 14, and a connecting shaft 1 is fixedly provided between the support blocks 13 on the front and rear sides, and the connecting shaft 1 is rotatably connected to the guide wheel 2 15, and the connecting shaft 1 passes through the front end of the front sliding cavity 14 It is fixedly connected to the spring rod three 12, the lower inclined end of the spring rod three 12 is slidably connected to the left inclined end of the matching block 11, the right inclined end of the matching block 11 is slidably connected to the inclined end of the connecting rod 10, and the upper right part of the fixed plate 47 is symmetrically provided with support rods three on the front and rear sides, and the upper side of the support rod three is slidably provided with a sliding cavity two 9, the sliding cavity two 9 is tilted, and a support block two 8 is slidably provided in the sliding cavity two 9, and a connecting shaft two is rotatably provided between the support blocks two 8 on the front and rear sides, and the connecting shaft two is fixedly connected to the winding wheel 7, and the connecting shaft two passes through the front end of the support block two 8 and is rotatably connected to the connecting rod 10 and fixedly connected to the working motor, and the working motor is fixedly connected to the connecting rod 10.

[0060] The beneficial effects of the above technical solution are:

[0061] After being extruded from the die head 46, the degradable film 21 passes through the tensioning wheel 41, the guide wheel 1 16 and the guide wheel 2 15 in sequence, and is finally wound up by the winding wheel 7. The working motor can drive the winding wheel 7 to rotate through the connecting shaft 2. The setting of the tensioning wheel 41 keeps the degradable film 21 in a tensioned state. By adjusting the gap between the guide wheel 1 16 and the guide wheel 2 15, the force required to pull the degradable film 21 through the guide wheel 1 16 and the guide wheel 2 15 can be changed, so that the degradable film 21 can be tightly wound around the winding wheel 7. When the degradable film 21 wound up on the winding wheel 7 is sufficient and its diameter becomes larger, the winding wheel 7 is connected to the connecting shaft 2. The connecting shaft 2 drives the supporting block 2 8 to slide downward along the sliding cavity 2 9, so that the upper end of the winding wheel 7 and the degradable film 21 wound thereon are kept flush with the gap between the guide wheel 1 16 and the guide wheel 2 15. The sliding cavity 2 9 is tilted so that the distance between the left end of the winding wheel 7 and the degradable film 21 wound thereon and the guide wheel 2 15 remains unchanged, thereby improving the stability of the process of pulling the degradable film 21. When the supporting block 2 8 slides downward along the sliding cavity 2 9, it drives the connecting rod 10 to move downward, the connecting rod 10 pushes the matching block 11 to slide to the left, the matching block 11 pushes the spring rod 3 12 to move upward, and the spring rod 3 12 drives The support block 13 slides upward along the sliding cavity 14, thereby driving the guide wheel 2 15 to move upward. When the guide wheel 2 15 cannot move upward, the spring rod 3 12 is compressed, thereby increasing the force required for the degradable film 21 to pass through the guide wheel 16 and the guide wheel 2 15, ensuring that the reel 7 reels the degradable film 21 tighter and tighter. A laser rangefinder can be set in the sliding cavity 2 9 to detect the distance between the support block 2 8 and the installation surface of the laser rangefinder. The sliding distance of the support block 2 8 along the sliding cavity 2 9, that is, the moving distance of the connecting rod 10, can be obtained according to the detection change value of the laser rangefinder. When the connecting rod 10 reaches the target sliding After the dynamic stroke, the laser rangefinder controls the alarm through the controller three to sound an alarm, reminding the working shaft that the winding wheel 7 has completed winding. At this time, the degradable film 21 needs to be cut off. After the rolled-up degradable film 21 is removed, under the elastic action of the spring rod three 12, the winding wheel 7 and the guide wheel two 15 return to their original positions, so that the weight of the degradable film 21 rolled up by the winding wheel 7 is constant, which is conducive to the standardization of the winding of the degradable film 21, and the sliding stroke of the connecting rod 10 and the matching block 11 is less than the target value, so as to avoid the degradable film 21 passing through the guide wheel one 16 and the guide wheel two 15. The force required is too large, which causes the degradable film 21 to be pulled apart.

[0062] Example 5

[0063] On the basis of embodiment 4, a control method for a working motor is also included, comprising the following steps:

[0064] Step 1: a weighing sensor is arranged at the contact end between the supporting block 2 8 and the connecting shaft 2 to detect the total mass of the winding wheel 7 and the degradable film 21 wound thereon;

[0065] Step 2: Electrically connect the working motor to the inverter;

[0066] Step 3: Electrically connect the controller 4 to the frequency converter and the weighing sensor;

[0067] Step 4: Controller 4 calculates the theoretical speed of the working motor according to the detection value of the weighing sensor and formula (1). Controller 4 controls the inverter to work according to the theoretical speed of the working motor so that the actual speed of the working motor reaches the theoretical speed of the working motor.

[0068]

[0069] Among them, N is the theoretical rotation speed of the working motor, M is the total mass of the connecting shaft 2, the winding wheel 7 and the degradable film 21 wound thereon, ρ is the density of the degradable film 21, h is the length of the winding wheel 7 along the front-to-back direction, K is the stiffness coefficient of the spring rod 3 12, X is the telescopic distance of the spring rod 3 12, F is the tensioning force of the tensioning wheel 41 on the degradable film 21, and P is the working power of the working motor.

[0070] The beneficial effects of the above technical solution are:

[0071] A weighing sensor is arranged at the contact end between the supporting block 2 8 and the connecting shaft 2 to detect the total mass of the winding wheel 7 and the degradable film 21 wound thereon; the working motor is electrically connected to the frequency converter; the controller 4 is electrically connected to the frequency converter and the weighing sensor; the controller 4 calculates the theoretical speed of the working motor according to the detection value of the weighing sensor and the formula (1); the controller 4 controls the frequency converter to work according to the theoretical speed of the working motor, so that the actual speed of the working motor reaches the theoretical speed, and the torque of the working motor is changed by automatically adjusting the theoretical speed of the working motor, so that it is ensured that as the weight of the degradable film 21 on the winding wheel 7 gradually increases, the winding wheel 7 can still normally perform the winding step of the degradable film 21, and avoid the increase of the force required to pull the degradable film 21 through the guide wheel 1 16 and the guide wheel 2 15, and the weight of the winding wheel 7 and the degradable film 21 thereon increases, and the working motor cannot drive the winding wheel 7 to rotate normally.

[0072] A method for preparing an environmentally friendly biodegradable film for high-standard farmland. The prepared environmentally friendly biodegradable film for high-standard farmland is used in farmland planting.

[0073] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for preparing an environmentally friendly biodegradable film for high-standard farmland, characterized in that: The following steps are involved: Step 1: preparing cotton stalk fine powder; Step 2: taking target weight portions of high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, cotton stalk powder, modified starch, dispersant, plasticizer and surfactant and putting the above materials into a stirring mechanism and mixing them evenly to obtain a mixed material; Step 3: placing the mixed material obtained in step 2 into an extruder for melt extrusion to obtain a degradable film (21); Step 4: rolling up the degradable film (21) through an anti-loosening rolling mechanism; The stirring mechanism comprises a stirring shell (18), a crushing chamber (19) is provided inside the left side of the upper end of the stirring shell (18), a feeding chamber (29) is provided inside the right side of the upper end of the stirring shell (18), a mixing chamber (20) is provided inside the lower end of the stirring shell (18), the crushing chamber (19) is communicated with the mixing chamber (20) through a feeding port (22), a blocking plate (48) is rotatably provided in the feeding port (22), a crushing rod (17) is rotatably provided in the crushing chamber (19), a cylindrical section of the crushing rod (17) passes through the upper end of the crushing chamber (19) and is fixedly connected to a third motor (39), a stirring rod (42) is rotatably provided in the mixing chamber (20), the stirring rod (42) passes through the upper end of the mixing chamber (20) and is fixedly connected to a second motor (6), and both the second motor (6) and the third motor (39) are mounted on the stirring shell (18); The extrusion mechanism comprises an extrusion shell (1), which is mounted on a bracket (2). An extrusion chamber (4) is provided inside the extrusion shell (1). A threaded extrusion rod (5) is rotatably provided in the extrusion chamber (4). The cylindrical section of the threaded extrusion rod (5) passes through the left end of the extrusion shell (1) and is fixedly connected to a motor (3). The motor (3) is fixedly arranged at the left end of the extrusion shell (1). An inlet (37) is provided at the upper end of the extrusion shell (1). A baffle (38) is rotatably provided in the inlet (37). The extrusion chamber (4) is communicated with a mixing chamber (20) through the inlet (37). A die head (46) is installed at the right end outlet of the extrusion chamber (4). An insulation shell is provided on the right side of the extrusion shell (1). A plurality of heaters (45) are provided inside the insulation shell. The plurality of heaters (45) are installed on the extrusion shell (1). A water outlet pipe (43) is provided in the middle of the lower end of the extrusion shell (1). A collecting shell (44) is correspondingly provided at the lower end of the water outlet pipe (43). The collecting shell (44) is fixedly connected to the bracket (2). The anti-loosening winding mechanism comprises a fixing plate (47), the fixing plate (47) is fixedly connected to the bracket (2), a support rod 1 is symmetrically provided on the front and rear sides of the upper left part of the fixing plate (47), a tensioning wheel (41) is rotatably provided between the support rods 1 on the front and rear sides, a support rod 2 (40) is symmetrically provided on the front and rear sides of the middle part of the upper end of the fixing plate (47), a guide wheel 1 (16) is rotatably provided between the upper parts of the support rods 2 (40) on the front and rear sides, a sliding cavity 1 (14) is slidably provided on the lower side of the support rod 2 (40), a support block 1 (13) is slidably provided in the sliding cavity 1 (14), a connecting shaft 1 is fixedly provided between the support blocks 1 (13) on the front and rear sides, the connecting shaft 1 is rotatably connected to the guide wheel 2 (15), and the connecting shaft 1 passes through the front end of the front sliding cavity 1 (14). The fixing plate (47) is fixedly connected to the spring rod three (12); the lower inclined end of the spring rod three (12) is slidably connected to the left inclined end of the matching block (11); the right inclined end of the matching block (11) is slidably connected to the inclined end of the connecting rod (10); a support rod three is symmetrically provided on the front and rear sides of the upper right part of the fixing plate (47); a sliding cavity two (9) is slidably provided on the upper side of the support rod three; the sliding cavity two (9) is inclined; a support block two (8) is slidably provided in the sliding cavity two (9); a connecting shaft two is rotatably provided between the support blocks two (8) on the front and rear sides; the connecting shaft two is fixedly connected to the winding wheel (7); the connecting shaft two passes through the front end of the support block two (8) and is rotatably connected to the connecting rod (10) and fixedly connected to the working motor; the working motor is fixedly connected to the connecting rod (10).

2. The method for preparing an environmentally friendly biodegradable film for high-standard farmland according to claim 1, characterized in that: The specific steps of step 1 are: Step 11: taking a certain amount of cotton stalks and a modifier in a weight ratio of 100:3 to 11; Step 12: Crush the cotton stalks to 0.5 mm to 1.5 mm, then add the modifier and stir at room temperature for 3 h to 4 h.

3. The method for preparing an environmentally friendly biodegradable film for high-standard farmland according to claim 1, characterized in that: The weight ratio of high-density polyethylene, low-density polyethylene, polylactic acid, polyglycolide, cotton stalk powder, modified starch, dispersant, plasticizer and surfactant is 10-15:22-34:5-10:2-7:23-37:12-22:4-9:1-5:1-3.

4. The method for preparing an environmentally friendly biodegradable film for high-standard farmland according to claim 1, characterized in that: The feeding chamber (29) and the feeding port (22) are both provided with metering mechanisms, the metering mechanisms comprising a placement plate 1 (23) slidably arranged in the feeding port (22) and a placement plate 2 (30) slidably arranged in the feeding chamber (29), a discharge port (31) is penetrated through the middle of the placement plate 1 (23) and the placement plate 2 (30), the inclined ends on the left and right sides of the placement plate 1 (23) and the placement plate 2 (30) are inclined in the direction of the discharge port (31), and a rotating shaft ( 33), the rotating shaft (33) is fixedly connected to the baffle plate (32), the rotating shaft (33) is connected via a driving mechanism 1, the driving mechanism 1 is arranged in the placement plate 1 (23) and the placement plate 2 (30), the driving mechanism 1 comprises a pulley 1, a connecting belt (34), a pulley 2 (35) and a driving motor (36), the pulley 1 is fixedly connected to the rotating shaft (33), the pulley 2 (35) is fixedly connected to the driving motor (36), and the pulley 1 is connected to the pulley 2 (35) via the connecting belt (34).

5. The method for preparing an environmentally friendly biodegradable film for high-standard farmland according to claim 4, characterized in that: The lower end of the placement plate 1 (23) is fixedly connected to the fixing rod 1 (24), the fixing rod 1 (24) penetrates the upper end of the sealing cavity 1 (25) and enters the sealing cavity 1 (25) and is fixedly connected to the sealing plate 1, the sealing plate 1 and the sealing cavity 1 (25) are slidably connected, and a spring rod 1 is fixedly provided between the sealing plate 1 and the sealing cavity 1 (25), the sealing cavity 1 (25) is arranged at the side end of the feeding port (22), the lower end of the placement plate 2 (30) is fixedly connected to the fixing rod 2 (28), the fixing rod 2 (28) penetrates the upper end of the sealing cavity 2 (27) and enters the sealing cavity 2 (27) and is fixedly connected to the sealing plate 2 (26), the sealing plate 2 (26) and the sealing cavity 2 (27) are slidably connected, and a spring rod 2 is fixedly provided between the sealing plate 2 (26) and the sealing cavity 2 (27), and the sealing cavity 2 (27) is arranged at the side end of the feeding cavity (29).

6. The method for preparing an environmentally friendly biodegradable film for high-standard farmland according to claim 5, characterized in that: A first air pressure detector is provided in the first sealed chamber (25), and a second air pressure detector is provided in the second sealed chamber (27). The first air pressure detector is electrically connected to a drive motor (36) in the first placement plate (23) through a first controller, and the second air pressure detector is electrically connected to a drive motor (36) in the second placement plate (30) through a second controller.

7. An environmentally friendly biodegradable film for high-standard farmland prepared by the method for preparing the environmentally friendly biodegradable film for high-standard farmland as described in any one of claims 1 to 6 is used in farmland planting.

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