Extrusion device for producing degradable TPU (thermoplastic polyurethane) plastic film

Abstract

The invention discloses an extrusion device for producing a degradable TPU plastic film. The extrusion device comprises a machine body, and a melting mechanism is fixedly mounted at the position, close to the left side, of the top of the machine body. Plastic particles are molten through the melting mechanism, and when molten raw materials are poured into the extrusion mechanism, the vibration impact effect is generated, bubbles in the plastic particle melting process are effectively removed, and the physical performance and the overall quality of a film extruded subsequently are improved; secondly, the extrusion mechanism is matched with the traction mechanism, transverse discharging is stably converted into vertical conveying, torsional fracture of the thin film is avoided, multi-stage cooling is conducted through water cooling spray holes, vertical arrangement of the thin film is combined, gravity drainage is utilized, two sets of brushes are attached to the two sides of the thin film, and cooling water residue is reduced; in addition, the device also improves the utilization rate of raw materials, reduces the waste of the raw materials, simplifies the cleaning and maintenance process, and brings remarkable economic benefits and social benefits for enterprises.

Description

Technical Field

[0001] This invention relates to the field of plastic film production technology, and more specifically to an extrusion apparatus for the production of biodegradable TPU plastic film. Background Technology

[0002] In the field of plastic film production, especially in the production of biodegradable thermoplastic polyurethane (TPU) films, technological challenges and demands coexist. With increasing environmental awareness and the popularization of sustainable development concepts, the market demand for biodegradable plastic materials is growing daily. As an environmentally friendly material, TPU, due to its excellent biodegradability, elasticity, and abrasion resistance, shows broad application prospects in various fields such as packaging, agricultural coverings, and medical supplies.

[0003] Chinese patent (CN213166737U) discloses a cooling device for plastic film extrusion production, including a cooling box, a positioning roller, and a fixed square groove. A feeding roller is distributed on the left side of the cooling box, and a coolant storage frame is provided inside the left end of the cooling box. The other end of the transmission belt is connected to a transmission motor. A movable groove is opened inside the left end of the winding roller. A pull rod is fixed to the outer wall of the middle part of the movable rod, and a limit groove is distributed on the outside of the pull rod. A compression spring is connected to the left end of the movable rod, and a fixed cylinder is distributed outside the compression spring. This patent mainly addresses the cooling problem of the film; however, from a technical perspective, this patent also uses conventional transverse extrusion followed by cooling with coolant and subsequent drying equipment. This method still does not solve the aforementioned technical problem. Summary of the Invention

[0004] To solve the above-mentioned technical problems, an extrusion apparatus for the production of biodegradable TPU plastic film is provided. This technical solution solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An extrusion apparatus for producing biodegradable TPU plastic film includes a machine body. A melting mechanism is fixedly installed on the top of the machine body near the left side. An extrusion mechanism is arranged below the melting mechanism. The melting mechanism is used to melt plastic granules and remove air bubbles, and add them to the extrusion mechanism. A traction mechanism is connected to the discharge end of the extrusion mechanism. The extrusion mechanism and the traction mechanism cooperate to change the horizontally discharged plastic film into a vertical direction and to water cool the plastic film. A scraping mechanism is installed on the rear side of the top of the machine body. The scraping mechanism is used to scrape off the cooling water remaining on both sides of the plastic film.

[0006] Preferably, the melting mechanism includes a melting frame fixedly connected to the top of the machine body. The melting frame is composed of a cuboid frame and a triangular frame. A second fixing frame is welded to the outside of the melting frame. A second stepper motor is provided at the bottom of the inside of the second fixing frame. The output end of the second stepper motor is fixedly connected to a second lead screw. A second guide rod is also fixedly installed inside the second fixing frame. A second lifting component is slidably connected to the outer wall of the second guide rod. The second lifting component is threadedly connected to the outer wall of the second lead screw. A scraper is provided at the top of the inside of the melting frame. The second lifting component is fixedly connected to the scraper.

[0007] Preferably, a second drive motor is fixedly connected to the outer wall of the triangular frame on the melting frame. The output end of the second drive motor extends into the melting frame and is fixedly connected to the rotating rod. A transmission gear is fixedly installed on the outer wall of the rotating rod. A discharge trough is provided at the middle position inside the melting frame, and a sealing plate is provided inside the discharge trough.

[0008] Preferably, each of the four bottom corners of the sealing plate is rotatably connected to a connecting arm, the other end of which is rotatably connected to a movable frame. A rack is fixedly installed at the bottom of the movable frame, and the rack meshes with a transmission gear. An L-shaped groove is provided on one side of the inside of the melting frame, and a guide rod is fixedly installed on the other side of the inside of the melting frame. The movable frame is slidably connected to the guide rod. A rod is provided on the outer side of one set of connecting arms, and the rod is slidably connected inside the L-shaped groove. A scraper is also installed inside the melting frame.

[0009] Preferably, the extrusion mechanism includes a first fixed frame, a first lead screw, and a first guide rod. The first fixed frame is fixedly connected to the top front side of the machine body. The first lead screw is rotatably connected inside the first fixed frame. The first guide rod is fixedly connected inside the first fixed frame. A first lifting member is threadedly connected to the outer wall of the first lead screw. The first lifting member is slidably connected to the first guide rod. A first stepper motor is provided at the top of the first fixed frame. The top end of the first lead screw is fixedly connected to the output end of the first stepper motor.

[0010] Preferably, the extrusion mechanism further includes a first cylinder and a second cylinder. The first cylinder is fixedly installed inside the first lifting member. The second cylinder is rotatably connected to the first cylinder. The first cylinder is also rotatably connected to the first lifting member. A driven gear is fixedly installed on the outer wall of the first cylinder. A first drive motor is provided on the outer wall of the first lifting member. A drive gear meshing with the driven gear is fixedly connected to the output end of the first drive motor. A feed frame is connected to the top of the first cylinder.

[0011] Preferably, the first cylinder and the second cylinder are rotatably connected to the same set of spiral conveying shafts. Water-cooled plates and fixing components are respectively connected to both sides of the discharge end of the second cylinder. Water-cooled spray holes are provided on the water-cooled plates and fixing components.

[0012] Preferably, the traction mechanism includes a third fixed frame fixedly connected to the right side of the top of the machine body. A third guide rod is welded inside the third fixed frame. A movable block is slidably connected to the outer wall of the third guide rod. The movable block is threadedly connected to the outer wall of the third lead screw. The third lead screw is rotatably connected inside the third fixed frame. A third stepper motor for driving the third lead screw to rotate is provided on the outer wall of the third fixed frame. A first electric push rod is installed on the top of the movable block. The output end of the first electric push rod is fixedly connected to a support member. A third drive motor is provided on the inner wall of the vertical plate of the support member. A support plate is fixedly installed on the output end of the third drive motor. A second electric push rod is provided on the top of the support plate. The output end of the second electric push rod is fixedly connected to a pressure plate.

[0013] Preferably, the scraping mechanism includes a lifting frame, a fourth fixed frame welded to the top rear side of the machine body, a fourth lead screw rotatably connected inside the fourth fixed frame, the lifting frame threadedly connected to the outer wall of the fourth lead screw, a fourth guide rod fixedly installed inside the fourth fixed frame, the lifting frame and the fourth guide rod slidably connected, the top of the fourth lead screw fixedly connected to the output end of a fourth stepper motor, and the fourth stepper motor is located at the top of the fourth fixed frame.

[0014] Preferably, the scraping mechanism further includes a threaded rod and a fixed rod. The threaded rod is rotatably connected to the inside of the lifting frame, and the fixed rod is welded to the inside of the lifting frame. Both ends of the outer wall of the threaded rod are threaded with brushes. Both sets of brushes are slidably connected to the fixed rod, and the threads at both ends of the threaded rod have opposite directions. A servo motor for driving the threaded rod to rotate is provided on the outer wall of the lifting frame.

[0015] Compared with the prior art, the present invention provides an extrusion apparatus for the production of biodegradable TPU plastic film, which has the following beneficial effects: This invention uses a melting mechanism to melt plastic granules. When the melted material is poured into the extrusion mechanism, it undergoes a "vibration and impact" effect, effectively removing air bubbles generated during the melting process and improving the physical properties and overall quality of the extruded film. Secondly, the extrusion mechanism, in conjunction with the traction mechanism, smoothly converts the transverse discharge to vertical conveying, preventing film twisting and breakage. Multi-stage cooling via water-cooled nozzles, combined with gravity drainage utilizing the vertical film orientation and two sets of brushes adhering to both sides of the film, reduces residual cooling moisture. Furthermore, this device improves raw material utilization, reduces waste, and simplifies cleaning and maintenance processes, bringing significant economic and social benefits to enterprises. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the extrusion mechanism in this invention; Figure 3 This is a schematic diagram of the structure of the first cylinder and the second cylinder in this invention; Figure 4 This is a schematic diagram of the melting mechanism in this invention; Figure 5 This is a schematic diagram of the installation position structure of the sealing plate in this invention; Figure 6 This is a schematic diagram of the traction mechanism in this invention; Figure 7 This is a schematic diagram of the support structure in this invention; Figure 8 This is a schematic diagram of the scraping mechanism in this invention; Figure 9 This is a schematic diagram of the internal structure of the lifting frame in this invention.

[0017] The numbers on the map are: 1. Organism; 2. Extrusion mechanism; 201. First fixed frame; 202. First lead screw; 203. First guide rod; 204. First stepper motor; 205. First lifting component; 206. First cylinder; 207. Feed frame; 208. Screw conveyor shaft; 209. Second cylinder; 210. Driven gear; 211. First drive motor; 212. Drive gear; 213. Water-cooled plate; 214. Fixing component; 215. Water-cooled nozzle; 3. Melting mechanism; 301. Melting frame; 302. Second fixed frame; 303. Second stepper motor; 304. Second lead screw; 305. Second guide rod; 306. Second lifting component; 307. Scraper; 308. Second drive motor; 309. Rotating rod; 310. Transmission gear; 311. Discharge chute; 312. Sealing plate; 313. Connecting arm; 314. L-shaped groove; 315. Rod body; 316. Rack; 317. Guide rod; 318. Scraper; 4. Traction mechanism; 401. Third fixed frame; 402. Third lead screw; 403. Third guide rod; 404. Third stepper motor; 405. Moving block; 406. First electric push rod; 407. Support component; 408. Third drive motor; 409. Support plate; 410. Second electric push rod; 411. Pressure plate; 5. Scraping mechanism; 501. Fourth fixed frame; 502. Fourth lead screw; 503. Fourth guide rod; 504. Fourth stepper motor; 505. Lifting frame; 506. Threaded rod; 507. Fixed rod; 508. Servo motor; 509. Brush. Detailed Implementation

[0018] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. Example 1

[0019] Please refer to Figures 1-9 As shown, an extrusion device for producing biodegradable TPU plastic film includes a body 1. A melting mechanism 3 is fixedly installed on the top of the body 1 near the left side. An extrusion mechanism 2 is arranged below the melting mechanism 3. The melting mechanism 3 is used to melt plastic particles and remove air bubbles, and add them to the extrusion mechanism 2. A traction mechanism 4 is connected to the discharge end of the extrusion mechanism 2. The extrusion mechanism 2 and the traction mechanism 4 cooperate to turn the horizontally discharged plastic film into a vertical one and to water cool the plastic film. A scraping mechanism 5 is installed on the rear top of the body 1. The scraping mechanism 5 is used to scrape off the cooling water remaining on both sides of the plastic film. Example 2

[0020] Please refer to Figure 4As shown, the melting mechanism 3 includes a melting frame 301 fixedly connected to the top of the body 1. The melting frame 301 is composed of a cuboid frame and a triangular frame. A second fixing frame 302 is welded to the outside of the melting frame 301. A second stepper motor 303 is provided at the bottom of the inside of the second fixing frame 302. The output end of the second stepper motor 303 is fixedly connected to the second lead screw 304. A second guide rod 305 is also fixedly installed inside the second fixing frame 302. A second lifting member 306 is slidably connected to the outer wall of the second guide rod 305. The second lifting member 306 is threadedly connected to the outer wall of the second lead screw 304. A scraper 307 is provided at the top of the inside of the melting frame 301. The second lifting member 306 is fixedly connected to the scraper 307.

[0021] Please refer to Figure 4 and Figure 5 As shown, a second drive motor 308 is fixedly connected to the outer wall of the triangular frame on the melting frame 301. The output end of the second drive motor 308 extends into the melting frame 301 and is fixedly connected to the rotating rod 309. A transmission gear 310 is fixedly installed on the outer wall of the rotating rod 309. A discharge trough 311 is provided in the middle position inside the melting frame 301. A sealing plate 312 is provided inside the discharge trough 311.

[0022] Please refer to Figure 5 As shown, connecting arms 313 are rotatably connected to the four corners of the bottom of the sealing plate 312. The other end of the connecting arm 313 is rotatably connected to the movable frame. A rack 316 is fixedly installed at the bottom of the movable frame. The rack 316 meshes with the transmission gear 310. An L-shaped groove 314 is opened on one side of the inside of the melting frame 301. A guide rod 317 is fixedly installed on the other side of the inside of the melting frame 301. The movable frame is slidably connected to the guide rod 317. A rod body 315 is provided on the outside of one set of connecting arms 313. The rod body 315 is slidably connected inside the L-shaped groove 314. A scraper 318 is also installed inside the melting frame 301.

[0023] Those skilled in the art will understand that heating plates are embedded in all the inner walls of the upper half of the melting frame 301, and the sealing plate 312 is located inside the discharge trough 311. When plastic granules are placed into the melting frame 301, they will accumulate on the top of the sealing plate 312. The heating plates melt the plastic granules. After melting, the output end of the second drive motor 308 is controlled to rotate, causing the rotating rod 309 and the transmission gear 310 to rotate as a whole, driving the rack 316 to move. The rod 315 moves in the L-shaped groove 314, and all the connecting arms 313 rotate synchronously. This allows the moving frame to move downwards first and then towards the inside of the upper triangular frame of the melting frame 301, thereby opening the discharge trough 311 and pouring the melted raw material into the extrusion mechanism 2 below. The melting frame 301 has a certain height, and when the raw material is poured in, a "vibration and impact" effect occurs, thereby eliminating air bubbles inside the raw material. In addition, by controlling the output end of the second stepper motor 303 to rotate, the second lead screw 304 rotates, which drives the second lifting member 306 to move up and down along the outer wall of the second guide rod 305, thereby driving the scraper 307 to move up and down. Example 3

[0024] Please refer to Figure 2 As shown, the extrusion mechanism 2 includes a first fixed frame 201, a first lead screw 202, and a first guide rod 203. The first fixed frame 201 is fixedly connected to the top front side of the machine body 1. The first lead screw 202 is rotatably connected inside the first fixed frame 201. The first guide rod 203 is fixedly connected inside the first fixed frame 201. A first lifting member 205 is threadedly connected to the outer wall of the first lead screw 202. The first lifting member 205 is slidably connected to the first guide rod 203. A first stepper motor 204 is provided at the top of the first fixed frame 201. The top end of the first lead screw 202 is fixedly connected to the output end of the first stepper motor 204.

[0025] Please refer to Figure 3 As shown, the extrusion mechanism 2 also includes a first cylinder 206 and a second cylinder 209. The first cylinder 206 is fixedly installed inside the first lifting member 205. The second cylinder 209 is rotatably connected to the first cylinder 206. The first cylinder 206 is also rotatably connected to the first lifting member 205. A driven gear 210 is fixedly installed on the outer wall of the first cylinder 206. A first drive motor 211 is provided on the outer wall of the first lifting member 205. A drive gear 212 that meshes with the driven gear 210 is fixedly connected to the output end of the first drive motor 211. A feed frame 207 is connected to the top of the first cylinder 206.

[0026] Please refer to Figure 3 As shown, the first cylinder 206 and the second cylinder 209 are both rotatably connected to the same set of spiral conveying shafts 208. The two sides of the discharge end of the second cylinder 209 are respectively connected to water-cooled plates 213 and fixing parts 214. Water-cooled spray holes 215 are provided on both the water-cooled plates 213 and the fixing parts 214.

[0027] Those skilled in the art will understand that by controlling the output end of the first stepper motor 204 to rotate, the first lead screw 202 rotates, driving the first lifting member 205 to move up and down along the outer wall of the first guide rod 203, thereby realizing the overall up and down reciprocating motion of the first cylinder 206 and the second cylinder 209; and by driving the drive gear 212 to rotate through the output end of the first drive motor 211, the driven gear 210 rotates, driving the second cylinder 209 to rotate on the right side of the first cylinder 206. Example 4

[0028] Please refer to Figure 6 and Figure 7 As shown, the traction mechanism 4 includes a third fixed frame 401 fixedly connected to the top right side of the body 1. A third guide rod 403 is welded inside the third fixed frame 401. A moving block 405 is slidably connected to the outer wall of the third guide rod 403. The moving block 405 is threadedly connected to the outer wall of the third lead screw 402. The third lead screw 402 is rotatably connected to the inside of the third fixed frame 401. A third stepper motor 404 for driving the third lead screw 402 to rotate is provided on the outer wall of the third fixed frame 401. A first electric push rod 406 is installed on the top of the moving block 405. The output end of the first electric push rod 406 is fixedly connected to the support member 407. A third drive motor 408 is provided on the inner wall of the vertical plate of the support member 407. A support plate 409 is fixedly installed on the output end of the third drive motor 408. A second electric push rod 410 is provided on the top of the support plate 409. The output end of the second electric push rod 410 is fixedly connected to the pressure plate 411.

[0029] Those skilled in the art will understand that by controlling the output end of the third stepper motor 404 to rotate, the third lead screw 402 rotates, driving the moving block 405 to move horizontally back and forth along the outer wall of the third guide rod 403, thereby achieving the horizontal back and forth movement of the support plate 409 and the pressure plate 411 as a whole; and by controlling the output end of the first electric push rod 406 to extend or retract, the support plate 409 and the pressure plate 411 as a whole can move upward or downward. Example 5

[0030] Please refer to Figure 8 As shown, the scraping mechanism 5 includes a lifting frame 505, a fourth fixed frame 501 welded to the rear top of the body 1, a fourth lead screw 502 rotatably connected inside the fourth fixed frame 501, the lifting frame 505 threadedly connected to the outer wall of the fourth lead screw 502, a fourth guide rod 503 fixedly installed inside the fourth fixed frame 501, the lifting frame 505 and the fourth guide rod 503 slidably connected, the top of the fourth lead screw 502 fixedly connected to the output end of the fourth stepper motor 504, and the fourth stepper motor 504 is located on the top of the fourth fixed frame 501.

[0031] Please refer to Figure 9 As shown, the scraping mechanism 5 also includes a threaded rod 506 and a fixed rod 507. The threaded rod 506 is rotatably connected to the inside of the lifting frame 505, and the fixed rod 507 is welded to the inside of the lifting frame 505. Both ends of the outer wall of the threaded rod 506 are threadedly connected to brushes 509. Both sets of brushes 509 are slidably connected to the fixed rod 507, and the threads at both ends of the threaded rod 506 are in opposite directions. A servo motor 508 for driving the threaded rod 506 to rotate is provided on the outer wall of the lifting frame 505.

[0032] Those skilled in the art will understand that by controlling the output end of the fourth stepper motor 504 to rotate, the fourth lead screw 502 rotates, driving the lifting frame 505 to move up and down along the outer wall of the fourth guide rod 503, thereby realizing the up and down reciprocating motion of the two sets of brushes 509; and by controlling the output end of the servo motor 508 to rotate, the threaded rod 506 rotates, thereby driving the two sets of brushes 509 to move closer or further apart.

[0033] To clearly describe the working principle of this invention, we will use... Figure 1 This is explained from a directional perspective, which refers to the "up, down, left, right, front, and back" as mentioned below, specifically as follows: S1. By controlling the output end of the second stepper motor 303 to rotate, the second lead screw 304 rotates, which drives the second lifting component 306 to move upward along the outer wall of the second guide rod 305, thereby driving the scraper 307 to move upward, opening the top opening of the melting frame 301, and the sealing plate 312 is located inside the discharge trough 311. S2. Plastic granules are injected into the melting frame 301 through an external feeding device. The plastic granules accumulate on the top of the sealing plate 312. The output end of the second stepper motor 303 is rotated in the opposite direction, so that the scraper 307 covers the top opening of the melting frame 301 again. The heating plate embedded in the inner wall of the melting frame 301 is activated, causing the accumulated plastic granules to melt. S3. The bottom of the melting frame 301 is inserted into the feed frame 207 on the first cylinder 206. After melting, the output end of the second drive motor 308 is controlled to rotate, causing the rotating rod 309 and the transmission gear 310 to rotate as a whole, driving the rack 316 to move. The rod 315 moves in the L-shaped groove 314, and all the connecting arms 313 rotate synchronously. This allows the moving frame to move downward first and then towards the inside of the upper triangular frame of the melting frame 301, thereby opening the discharge chute 311 and pouring the melted raw material into the first cylinder 206 below. The melting frame 301 has a certain height, and when the raw material is poured in, it undergoes a "vibration and impact" effect, thereby eliminating air bubbles inside the raw material and improving the quality of subsequent plastic film extrusion. S4. By driving the screw conveyor shaft 208 to rotate, the raw material is extruded from the first cylinder 206 and the second cylinder 209. Due to the shape of the discharge end of the second cylinder 209, a thin film is formed. Heating plates are also installed on the inner walls of the first cylinder 206 and the second cylinder 209. During the extrusion process, the molten raw material will not accidentally solidify due to the temperature drop. After the film is extruded, it is located on the top of the water-cooled plate 213 at the discharge end of the second cylinder 209. The water-cooled plate 213 cools it with water, so that the initial end of the film is quickly formed. S5. The support plate 409 is attached to the water cooling plate 213, and the initial end of the film is also located on the top of the support plate 409. By driving the output end of the second electric push rod 410 to extend, the pressure plate 411 moves downward to press and fix the initial end of the film. Then, by driving the output end of the first electric push rod 406 to extend, the clamped initial end of the film rises, so that the film is in a horizontal state. S6. Next, the output of the first drive motor 211 drives the drive gear 212 to rotate, causing the driven gear 210 to rotate, which in turn drives the second cylinder 209 to rotate on the right side of the first cylinder 206, keeping the discharge end of the second cylinder 209 in a vertical position. At the same time, the output of the third drive motor 408 rotates, causing the initial end of the clamped film to rotate along with the rotation of the second cylinder 209. In this way, the film becomes vertical. Through this operation, the film will not be twisted due to rotation and break unexpectedly, which improves the ingenuity of the design. S7. The vertical film is located between the water-cooling plate 213 and the fixing member 214. The water-cooling nozzles 215 on both start spraying cooling water to cool the film that is subsequently extruded. At the same time, under the action of the scraping mechanism 5, the two sets of brushes 509 descend and stick to both sides of the vertical film. The output end of the third stepper motor 404 rotates, causing the third lead screw 402 to rotate, driving the vertical film to the right to the next process on the outer right side. This continuous operation realizes the water cooling of the extruded film and the cleaning of the cooling water on its surface. Since the film is in a vertical state, the cooling water itself will flow downward on its surface due to gravity, without leaving a large amount of cooling water, which can be dried more quickly and meet the needs of the staff.

[0034] It is worth noting in this invention that if there is solidified material remaining inside the melting frame 301 and on the top of the sealing plate 312, this invention can also control the output end of the second stepper motor 303 to rotate, causing the second lead screw 304 to rotate, which drives the second lifting member 306 to move downward along the outer wall of the second guide rod 305, thereby driving the scraper 307 to move downward. The scraper 307 is in contact with the inner wall of the melting frame 301, so as to scrape off the solidified material remaining on the inner wall of the melting frame 301 cleanly, which is convenient and quick. The scraped solidified material falls into the first cylinder 206. In addition, by controlling the output end of the second drive motor 308 to rotate, the moving frame moves downward first and then moves towards the inside of the upper triangular frame of the melting frame 301, which drives the sealing plate 312 to also move towards the inside of the upper triangular frame of the melting frame 301. The top of the sealing plate 312 is flush with the bottom of the scraper 318, so as to scrape off the solidified material remaining on the top of the sealing plate 312. After scraping, the solidified material also slides down into the first cylinder 206 through the inclined surface inside the upper triangular frame of the melting frame 301. In summary, the scraped solidified raw materials will all enter the first cylinder 206. In this way, the heating plates inside the first cylinder 206 and the second cylinder 209 can heat and melt them, which improves the utilization rate of raw materials and prevents waste.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An extrusion apparatus for producing biodegradable TPU plastic film, comprising a body (1), characterized in that, A melting mechanism (3) is fixedly installed on the top of the machine body (1) near the left side. An extrusion mechanism (2) is provided below the melting mechanism (3). The melting mechanism (3) is used to melt the plastic particles and remove the air bubbles, and add them to the extrusion mechanism (2). A traction mechanism (4) is connected to the discharge end of the extrusion mechanism (2). The extrusion mechanism (2) and the traction mechanism (4) work together to turn the horizontally discharged plastic film into a vertical one and to water cool the plastic film. A scraping mechanism (5) is installed on the rear side of the top of the machine body (1). The scraping mechanism (5) is used to scrape off the cooling water remaining on both sides of the plastic film.

2. The extrusion apparatus for producing biodegradable TPU plastic film according to claim 1, characterized in that, The melting mechanism (3) includes a melting frame (301) fixedly connected to the upper part of the body (1). The melting frame (301) is composed of a cuboid frame and a triangular frame. A second fixed frame (302) is welded to the outside of the melting frame (301). A second stepper motor (303) is provided at the bottom of the inside of the second fixed frame (302). The output end of the second stepper motor (303) is fixedly connected to the second lead screw (304). A second guide rod (305) is also fixedly installed inside the second fixed frame (302). A second lifting member (306) is slidably connected to the outer wall of the second guide rod (305). The second lifting member (306) is threadedly connected to the outer wall of the second lead screw (304). A scraper (307) is provided at the top of the inside of the melting frame (301). The second lifting member (306) is fixedly connected to the scraper (307).

3. An extrusion apparatus for producing biodegradable TPU plastic film according to claim 2, characterized in that, A second drive motor (308) is fixedly connected to the outer wall of the upper triangular frame of the melting frame (301). The output end of the second drive motor (308) extends into the melting frame (301) and is fixedly connected to the rotating rod (309). A transmission gear (310) is fixedly installed on the outer wall of the rotating rod (309). A discharge trough (311) is provided in the middle position inside the melting frame (301). A sealing plate (312) is provided inside the discharge trough (311).

4. An extrusion apparatus for producing biodegradable TPU plastic film according to claim 3, characterized in that, Connecting arms (313) are rotatably connected to the four corners of the bottom of the sealing plate (312). The other end of the connecting arm (313) is rotatably connected to the moving frame. A rack (316) is fixedly installed at the bottom of the moving frame. The rack (316) meshes with the transmission gear (310). An L-shaped groove (314) is opened on one side of the inside of the melting frame (301). A guide rod (317) is fixedly installed on the other side of the inside of the melting frame (301). The moving frame is slidably connected to the guide rod (317). A rod body (315) is provided on the outside of one set of connecting arms (313). The rod body (315) is slidably connected inside the L-shaped groove (314). A scraper (318) is also installed inside the melting frame (301).

5. An extrusion apparatus for producing biodegradable TPU plastic film according to claim 1, characterized in that, The extrusion mechanism (2) includes a first fixed frame (201), a first lead screw (202) and a first guide rod (203). The first fixed frame (201) is fixedly connected to the top front side of the machine body (1). The first lead screw (202) is rotatably connected inside the first fixed frame (201). The first guide rod (203) is fixedly connected inside the first fixed frame (201). The outer wall of the first lead screw (202) is threadedly connected to a first lifting member (205). The first lifting member (205) is slidably connected to the first guide rod (203). A first stepper motor (204) is provided at the top of the first fixed frame (201). The top end of the first lead screw (202) is fixedly connected to the output end of the first stepper motor (204).

6. An extrusion apparatus for producing biodegradable TPU plastic film according to claim 5, characterized in that, The extrusion mechanism (2) further includes a first cylinder (206) and a second cylinder (209). The first cylinder (206) is fixedly installed inside the first lifting member (205). The second cylinder (209) is rotatably connected to the first cylinder (206). The first cylinder (206) is also rotatably connected to the first lifting member (205). A driven gear (210) is fixedly installed on the outer wall of the first cylinder (206). A first drive motor (211) is provided on the outer wall of the first lifting member (205). A drive gear (212) meshing with the driven gear (210) is fixedly connected to the output end of the first drive motor (211). A feed frame (207) is connected to the top of the first cylinder (206).

7. An extrusion apparatus for producing biodegradable TPU plastic film according to claim 6, characterized in that, The first cylinder (206) and the second cylinder (209) are rotatably connected to the same set of spiral conveying shafts (208). The two sides of the discharge end of the second cylinder (209) are respectively connected to a water-cooled plate (213) and a fixing member (214). Water-cooled spray holes (215) are provided on the water-cooled plate (213) and the fixing member (214).

8. An extrusion apparatus for producing biodegradable TPU plastic film according to claim 1, characterized in that, The traction mechanism (4) includes a third fixed frame (401) fixedly connected to the right side of the top of the body (1). A third guide rod (403) is welded inside the third fixed frame (401). A moving block (405) is slidably connected to the outer wall of the third guide rod (403). The moving block (405) is threadedly connected to the outer wall of the third lead screw (402). The third lead screw (402) is rotatably connected inside the third fixed frame (401). A third stepper for driving the third lead screw (402) to rotate is provided on the outer wall of the third fixed frame (401). The motor (404) and the top of the moving block (405) are equipped with a first electric push rod (406), the output end of the first electric push rod (406) is fixedly connected to the support member (407), the inner wall of the vertical plate of the support member (407) is provided with a third drive motor (408), the output end of the third drive motor (408) is fixedly installed with a support plate (409), the top of the support plate (409) is provided with a second electric push rod (410), and the output end of the second electric push rod (410) is fixedly connected to the pressure plate (411).

9. An extrusion apparatus for producing biodegradable TPU plastic film according to claim 1, characterized in that, The scraping mechanism (5) includes a lifting frame (505), a fourth fixed frame (501) is welded to the rear top of the body (1), a fourth lead screw (502) is rotatably connected inside the fourth fixed frame (501), the lifting frame (505) is threaded to the outer wall of the fourth lead screw (502), a fourth guide rod (503) is also fixedly installed inside the fourth fixed frame (501), the lifting frame (505) is slidably connected to the fourth guide rod (503), the top of the fourth lead screw (502) is fixedly connected to the output end of the fourth stepper motor (504), and the fourth stepper motor (504) is set on the top of the fourth fixed frame (501).

10. An extrusion apparatus for producing biodegradable TPU plastic film according to claim 9, characterized in that, The scraping mechanism (5) further includes a threaded rod (506) and a fixed rod (507). The threaded rod (506) is rotatably connected to the inside of the lifting frame (505), and the fixed rod (507) is welded to the inside of the lifting frame (505). Both ends of the outer wall of the threaded rod (506) are threaded with brushes (509). Both sets of brushes (509) are slidably connected to the fixed rod (507), and the threads at both ends of the threaded rod (506) are in opposite directions. A servo motor (508) for driving the threaded rod (506) to rotate is provided on the outer wall of the lifting frame (505).

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