Efficient polylactic acid biodegradation and recovery system

Abstract

The utility model discloses an efficient polylactic acid biodegradation recovery system which is characterized by comprising a degradation kettle, a guide rod is fixedly connected in the degradation kettle, a degradation kettle bearing is connected with a screw rod, the degradation kettle bearing is connected with a square hole shaft, and the degradation kettle is fixedly connected with a box body corresponding to the square hole shaft; the screw rod is in threaded connection with the lifting plate, and the guide rod penetrates through the lifting plate; a bearing of the stirring shaft is connected with the lifting plate, and the stirring shaft is fixedly connected with a group of uniformly distributed stirring rods; the hollow square shaft is fixedly connected with the stirring shaft. The utility model relates to the technical field of degradation, in particular to an efficient polylactic acid biodegradation and recovery system. The technical problem to be solved by the utility model is to provide the high-efficiency polylactic acid biodegradation recovery system, which is favorable for realizing that during polylactic acid biodegradation, a stirring rod stirs polylactic acid and simultaneously adds high-temperature water or introduces high-temperature hot air to accelerate degradation.

Description

Technical Field

[0001] The utility model relates to the technical field of degradation, in particular to a high-efficiency polylactic acid biodegradation recovery system. Background Art

[0002] As a new biodegradable material, polylactic acid (PLA) has broad application prospects. It can be used in food packaging, fast food lunch boxes, nonwovens, industrial and consumer fabrics, agricultural textiles, 3D printing, and other fields. In a humid environment, PLA molecules react with water, breaking down into low-molecular-weight substances. The rate of hydrolysis is affected by humidity and temperature: higher humidity and higher temperature result in faster hydrolysis of PLA.

[0003] Currently, there is still a lack of a recycling system that can achieve the goal of stirring the polylactic acid while adding high-temperature water or introducing high-temperature hot air during its biodegradation to accelerate degradation. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an efficient polylactic acid biodegradation recovery system, which is conducive to accelerating the degradation of polylactic acid by stirring it with a stirring rod while adding high-temperature water or introducing high-temperature hot air during biodegradation.

[0005] The utility model adopts the following technical solutions to achieve the purpose of the invention:

[0006] A highly efficient polylactic acid biodegradation and recycling system, characterized by comprising: a degradation kettle, internally fixedly connected to a guide rod; a bearing connected to a screw rod, which in turn is connected to a square-hole shaft; and a housing fixedly connected to the square-hole shaft; a lifting plate, threadedly connected to the screw rod and through which the guide rod passes; a stirring shaft, bearing-connected to the lifting plate and fixedly connected to a set of evenly distributed stirring rods; and a hollow square shaft fixedly connected to the stirring shaft and disposed within the square holes of the square-hole shaft. The stirring rods rotate and stir the polylactic acid as the degradation kettle moves along its height, accelerating decomposition.

[0007] As a further limitation of this technical solution, the degradation kettle is fixedly connected to a motor, the output shaft of the motor passes through the top plate of the degradation kettle and is fixedly connected to a small gear, the screw is fixedly connected to a large gear, the small gear meshes with the large gear, the output shaft of the motor is fixedly connected to a driving pulley, the square-hole shaft is fixedly connected to a driven pulley, one end of the synchronous belt is wrapped around the driving pulley, and the other end of the synchronous belt is wrapped around the driven pulley. By adopting gear meshing and synchronous belt transmission, the polylactic acid is stirred while moving in the height direction, accelerating the decomposition of the polylactic acid while moving in the height direction and rotating.

[0008] As a further limitation of this technical solution, the box body is fixed with a connecting joint, and the stirring shaft and stirring rod are both hollow rods, each of which is provided with a set of evenly distributed gas and liquid outlet holes. This ensures that the joint, box body, hollow square shaft, stirring shaft, stirring rod, and gas and liquid outlet holes are connected. By connecting the joint to an external hot water / hot air source, the appropriate humidity and temperature are provided for the hydrolysis of the polylactic acid.

[0009] As a further limitation of the present technical solution, each stirring rod is fixedly connected to a scraper rod, and the scraper rod is closely attached to the degradation kettle. The scraper rod moves along the wall of the degradation kettle to prevent the polylactic acid from adhering to the wall.

[0010] As a further limitation of the present technical solution, the screw is fixedly connected to the stop block.

[0011] As a further limitation of the present technical solution, the upper portion of the degradation kettle is fixedly connected to a feed pipe, which is threadedly connected to an end cap. The provision of the feed pipe facilitates the addition of polylactic acid into the degradation kettle.

[0012] As a further limitation of this technical solution, the bottom of the degradation kettle is fixedly connected to a discharge pipe, and a discharge valve is installed on the discharge pipe. By using the discharge pipe and the discharge valve, water and residue after the hydrolysis of polylactic acid can be discharged.

[0013] As a further limitation of this technical solution, a pressure relief valve is installed on the top plate of the degradation kettle. When polylactic acid is hydrolyzed, carbon dioxide is generated. By using a pressure relief valve, damage to the equipment caused by excessive pressure in the degradation kettle is avoided.

[0014] Compared with related technologies, the efficient polylactic acid biodegradation recovery system provided by the present invention has the following beneficial effects:

[0015] (1) The device uses a stirring rod that moves in the height direction and rotates to stir the polylactic acid, accelerating the decomposition;

[0016] (2) This device uses a hollow stirring shaft and stirring rod to allow high-temperature water or air to enter, thereby accelerating the decomposition of polylactic acid;

[0017] (3) The device is driven by a motor, and adopts gear meshing and a synchronous belt mechanism to realize the movement of the stirring rod, which is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0019] Figure 2 It is a partially cutaway three-dimensional structural schematic diagram of the present invention.

[0020] Figure 3This is a schematic diagram of the partial three-dimensional structure of the utility model Figure 1 .

[0021] Figure 4 This is a schematic diagram of the partial three-dimensional structure of the utility model Figure 2 .

[0022] Figure 5 This is a schematic diagram of the partial three-dimensional structure of the utility model Figure 3 .

[0023] In the figure: 1. Degradation kettle, 2. Pressure relief valve, 3. Box body, 4. Connector, 5. Motor, 6. Discharge valve, 7. Discharge pipe, 8. Feed pipe, 9. End cover, 10. Guide rod, 11. Screw, 12. Stop block, 13. Large gear, 14. Small gear, 15. Lifting plate, 16. Square hole shaft, 17. Driven pulley, 18. Synchronous belt, 19. Driving pulley, 20. Hollow square shaft, 21. Stirring shaft, 22. Stirring rod, 23. Gas and liquid outlet hole, 24. Scraper rod. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0025] Example 1: A high-efficiency polylactic acid biodegradation and recycling system comprises: a degradation vessel 1, fixedly connected to a guide rod 10, bearing-connected to a screw rod 11, bearing-connected to a square-hole shaft 16, and fixedly connected to a housing 3 corresponding to the square-hole shaft 16; a lifting plate 15, threadedly connected to the screw rod 11, and through which the guide rod 10 passes; a stirring shaft 21, bearing-connected to the lifting plate 15, fixedly connected to a group of evenly distributed stirring rods 22; and a hollow square shaft 20, fixedly connected to the stirring shaft 21 and disposed within the square holes of the square-hole shaft 16. The stirring rods 22 rotate and stir the polylactic acid while the degradation vessel 1 moves in the height direction, accelerating decomposition.

[0026] The degradation kettle 1 is fixedly connected to the motor 5. The output shaft of the motor 5 passes through the top plate of the degradation kettle 1 and is fixedly connected to the pinion 14. The screw 11 is fixedly connected to the large gear 13. The pinion 14 meshes with the large gear 13. The output shaft of the motor 5 is fixedly connected to the driving wheel 19. The square hole shaft 16 is fixedly connected to the driven wheel 17. One end of the synchronous belt 18 is wrapped around the driving wheel 19, and the other end of the synchronous belt 18 is wrapped around the driven wheel 17. By adopting gear meshing and synchronous belt transmission, the polylactic acid is stirred while rotating in the height direction, and the decomposition is accelerated while rotating in the height direction.

[0027] The model of the motor 5 is a servo motor MHMD022G1U.

[0028] Each stirring rod 22 is fixedly connected to a scraper rod 24, and the scraper rod 24 is closely attached to the degradation vessel 1. The scraper rod 24 moves along the wall of the degradation vessel 1 to prevent the polylactic acid from adhering to the wall.

[0029] The screw rod 11 is fixedly connected to the stop block 12 .

[0030] The upper part of the degradation kettle 1 is fixedly connected to a feed pipe 8, which is threadedly connected to an end cap 9. The feed pipe 8 facilitates the addition of polylactic acid into the degradation kettle 1.

[0031] The bottom of the degradation reactor 1 is fixedly connected to a discharge pipe 7, on which a discharge valve 6 is installed. By using the discharge pipe 7 and the discharge valve 6, water and residue after the hydrolysis of polylactic acid can be discharged.

[0032] The top plate of the degradation kettle 1 is equipped with a pressure relief valve 2. When polylactic acid is hydrolyzed, carbon dioxide is generated. By using the pressure relief valve 2, damage to the equipment caused by excessive pressure in the degradation kettle 1 is avoided.

[0033] The working principle of the efficient polylactic acid biodegradation recovery system provided by the utility model is as follows:

[0034] Pour appropriate amounts of polylactic acid and water into the degradation reactor 1 through the feed pipe 8.

[0035] The intermittent control motor 5 rotates back and forth, driving the small gear 14 and the driving wheel 19 to rotate. The small gear 14 drives the large gear 13 and the screw 11 to rotate. The screw 11 drives the lifting plate 15 to move along the guide rod 10. The lifting plate 15 drives the stirring shaft 21, the stirring rod 22, and the scraper 24 to move. The stirring shaft 21 drives the hollow square shaft 20 to move along the square hole shaft 16. The driving wheel 19 drives the driven wheel 17 and the square hole shaft 16 through the synchronous belt 18. The square hole shaft 16 drives the hollow square shaft 20, the stirring shaft 21, the stirring rod 22, and the scraper 24 to rotate. The stirring rod 21 stirs the polylactic acid and water to accelerate decomposition. The scraper 24 contacts the inner wall of the degradation vessel 1 to prevent the polylactic acid from sticking to the inner wall of the degradation vessel 1.

[0036] Example 2: This example further elaborates on Example 1. The housing 3 is fixedly connected to a connector 4. Both the stirring shaft 21 and the stirring rod 22 are hollow rods, and the stirring rod 22 is provided with a set of evenly distributed gas and liquid outlet holes 23. This ensures connectivity among the connector 4, housing 3, hollow square shaft 20, stirring shaft 21, stirring rod 22, and gas and liquid outlet holes 23. By connecting the connector 4 to an external hot water / hot air source, the appropriate humidity and temperature are maintained for the hydrolysis of the polylactic acid.

[0037] The working principle of the efficient polylactic acid biodegradation recovery system provided by the utility model is as follows:

[0038] Use a hose to connect one end to the connector 4 and the other end to the hot water / hot air source. When the intermittent control motor 5 rotates back and forth, the hot water / hot air source is turned on, and the upper end of the hollow square shaft 20 is always in the box body 3, so that the hot water / hot air is spirally ejected from the gas and liquid outlet 23 through the connector 4, the box body 3, the hollow square shaft 20, the stirring shaft 21 and the stirring rod 22, thereby accelerating the decomposition of polylactic acid.

[0039] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An efficient polylactic acid biodegradation recovery system, characterized by: include: A degradation kettle (1) is fixedly connected to a guide rod (10) therein, the degradation kettle (1) is connected to a screw rod (11) by a bearing, the degradation kettle (1) is connected to a square hole shaft (16) by a bearing, and the degradation kettle (1) is fixedly connected to a box body (3) corresponding to the square hole shaft (16); A lifting plate (15), wherein the screw rod (11) is threadedly connected to the lifting plate (15), and the guide rod (10) passes through the lifting plate (15); A stirring shaft (21), the bearing of which is connected to the lifting plate (15), and the stirring shaft (21) is fixedly connected to a group of evenly distributed stirring rods (22); The hollow square shaft (20) is fixedly connected to the stirring shaft (21), and the hollow square shaft (20) is arranged in the square hole of the square hole shaft (16).

2. The high-efficiency polylactic acid biodegradation recovery system according to claim 1 is characterized by: The degradation kettle (1) is fixedly connected to the motor (5), the output shaft of the motor (5) passes through the top plate of the degradation kettle (1) and is fixedly connected to the pinion (14), the screw (11) is fixedly connected to the large gear (13), the small gear (14) engages with the large gear (13), the output shaft of the motor (5) is fixedly connected to the driving wheel (19), the square hole shaft (16) is fixedly connected to the driven wheel (17), one end of the synchronous belt (18) surrounds the driving wheel (19), and the other end of the synchronous belt (18) surrounds the driven wheel (17).

3. The high-efficiency polylactic acid biodegradation recovery system according to claim 2 is characterized by: The box body (3) is fixedly connected to the joint (4); the stirring shaft (21) and the stirring rod (22) are both hollow rods; and the stirring rod (22) is provided with a group of evenly distributed gas and liquid outlet holes (23).

4. The high-efficiency polylactic acid biodegradation recovery system according to claim 1 is characterized by: Each stirring rod (22) is fixedly connected to a scraping rod (24), and the scraping rod (24) is closely attached to the degradation kettle (1).

5. The high-efficiency polylactic acid biodegradation recovery system according to claim 1 is characterized by: The screw rod (11) is fixedly connected to the stop block (12).

6. The high-efficiency polylactic acid biodegradation recovery system according to claim 1 is characterized by: The upper part of the degradation kettle (1) is fixedly connected to a feed pipe (8), and the feed pipe (8) is threadedly connected to an end cover (9).

7. The high-efficiency polylactic acid biodegradation recovery system according to claim 1 is characterized by: The bottom of the degradation kettle (1) is fixedly connected to a discharge pipe (7), and a discharge valve (6) is installed on the discharge pipe (7).

8. The high-efficiency polylactic acid biodegradation recovery system according to claim 1 is characterized by: A pressure relief valve (2) is installed on the top plate of the degradation kettle (1).

Images