Preparation device and method of lactic acid composite material

Abstract

The invention relates to the technical field of polylactic acid preparation, and discloses a lactic acid composite material preparation device and a method thereof.The edge of a device base is connected with a top table through a device shell, a melting tank is arranged in the middle of the top table, and the melting tank is fixed to the interior of the top table through a drainage part; the lower end of the drainage part is connected with a lifting injection pipe, a conical flow guide seat is fixed to the middle of the device base, the upper end of the conical flow guide seat is communicated with a purification seat, and an annular sealing protective cover is upwards riveted to the interior of the purification seat. According to the invention, the cooling crystallization rotary seat is designed, so that the cooling crystallization rotary seat has two effects, the injection flow channel is provided for sequentially carrying out cooling, impurity removal and cleaning operations on lactide in the crystallization tank, the structure is simplified, and the complexity of a plurality of processes of the preparation equipment is reduced; the large gear rotates in a speed reduction mode to drive the cooling crystallization rotating base to rotate intermittently, feeding, liquid discharging, sampling and discharging operation can be carried out on the crystallization tank in turn, and the automation degree is high.

Description

Technical Field

[0001] The present invention relates to the technical field of polylactic acid preparation, and in particular to a device and method for preparing a lactic acid composite material. Background Art

[0002] With the increasing severity of white pollution, biodegradable polyesters have become one of the most effective solutions to the problem of plastic pollution. They can be degraded into environmentally friendly carbon dioxide and water under composting conditions or natural conditions. In actual applications, polybutylene terephthalate (PBAT) and polylactic acid (PLA) are usually directly blended to form a PBAT-PLA blend with complementary properties, which is a biodegradable polyester with excellent performance. Among them, polylactic acid (PLA) is generally prepared by polycondensation through the ring-opening polymerization of lactide. Crude lactide is produced during the preparation process. Crude lactide contains impurities such as moisture and oligomers, which will interfere with the reaction process of polylactic acid synthesis, resulting in uneven molecular weight distribution of the polymer, decreased mechanical properties and other problems. In addition, moisture may also affect the storage stability of lactide, so the crude lactide in the preparation process needs to be purified and tested.

[0003] Existing crude lactide purification and detection devices have many technical problems when in use. First, the lactide melt currently lacks a cooling device within the device, resulting in a long time for complete crystal formation and low working efficiency. Second, lactic acid and oligomer impurities remain on the surface of the crystallized lactide and need to be cleaned with ethanol. The current common method is to briefly soak the crystals in ethanol solution, which not only wastes a large amount of ethanol, but also fails to completely remove impurities, resulting in poor impurity removal effect. Third, manual sampling is currently required to take a small amount of purified crystals and place them in a moisture detection device for testing. This method is time-consuming and labor-intensive, has a low degree of automation, and can result in inaccurate calibration quality, leading to errors in the test results.

[0004] In summary, considering that the existing facilities cannot meet the work requirements, we propose a preparation device and method for lactic acid composite materials. Summary of the Invention

[0005] The main purpose of the present invention is to provide a device and method for preparing a lactic acid composite material, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A device for preparing a lactic acid composite material includes a device base, the edge of the device base is connected to a top platform through a device shell, a melting tank is provided in the middle of the top platform, the melting tank is fixed by a drainage part and the interior of the top platform, the lower end of the drainage part is connected to a lifting injection pipe, and a lifting structure is installed on the lifting injection pipe, and the lifting structure drives the lifting injection pipe to move up and down.

[0007] As a preferred solution of the preparation device of a lactic acid composite material described in the present invention, a conical guide seat is fixed at the middle position of the base of the device, the lower end of the conical guide seat passes through the base of the device and is connected to a drain pipe, the upper end of the drain pipe is provided with a drain valve, the upper end of the conical guide seat is connected to a purification seat, an annular sealing shield is riveted upward inside the purification seat, a melt injection hole for inserting a descending injection pipe is provided at the top of the annular sealing shield, a sampling hole is provided starting from the front upper corner of the annular sealing shield, and a discharge port is provided at the bottom of the annular sealing shield.

[0008] As a preferred solution of the preparation device of the lactic acid composite material described in the present invention, wherein: a cooling crystallization turntable is arranged inside the annular sealing shield and rotates against the wall, and hollow short shafts are installed at the middle position on both sides of the cooling crystallization turntable, and two groups of the hollow short shafts are connected through the bearing seat and the inner wall of the annular sealing shield, one group of the hollow short shafts extends outward and is sleeved with a large gear, and a small gear is meshed with the lower end of the large gear, and the small gear is sleeved on the output shaft of the first servo motor, and the first servo motor is horizontally fixed inside the purification seat.

[0009] As a preferred solution of the preparation device of the lactic acid composite material described in the present invention, wherein: the annular surface seat of the cooling crystallization turntable is evenly provided with several groups of crystallization grooves, the number of the crystallization grooves is preferably 6-12 groups, and a card step is provided at the notch of the crystallization groove, and an electric unloading plate is sealed on the card step, and a through opening is provided in the middle of the electric unloading plate, and a control valve is installed in the through opening.

[0010] As a preferred solution of the preparation device of a lactic acid composite material described in the present invention, wherein: a pressure groove connected to one group of hollow short shafts is opened in the middle position inside the cooling crystallization turntable, and an air pressure port is opened between the pressure groove and each group of crystallization grooves, and the number of the air pressure ports is preferably 6-12 groups, and an electromagnetic valve is installed on the air pressure port, and a group of hollow short shafts away from the large gear extends outward and is connected to a positioning seal bearing, and the positioning seal bearing is fixed in the mounting groove, and the mounting groove is opened on the left position of the upper end surface of the purification seat, and the end of the positioning seal bearing away from the hollow short shaft is connected to a mixing pipe, and the end of the mixing pipe away from the positioning seal bearing is connected to a gas tank located in the mounting groove, and an electromagnetic pulse valve is installed at the position where the gas tank and the mixing pipe are connected, and the upper end of the mixing pipe is connected to a liquid inlet pipe, and the upper end of the liquid inlet pipe is connected to an ethanol liquid supply cylinder, and the ethanol liquid supply cylinder is installed on the upper end surface of the purification seat through a bracket, and the bottom of the ethanol liquid supply cylinder is provided with a first switch valve.

[0011] As a preferred solution of the preparation device of a lactic acid composite material described in the present invention, wherein: a clean water tank is provided on the left side of the upper end surface of the base of the device, the number of supporting legs at the bottom of the clean water tank is preferably 2-4 groups, a water pump is installed at the upper end of the clean water tank, one of the water outlet joints on the water pump is connected to a No. 1 water outlet pipe, the No. 1 water outlet pipe extends upward and is connected to the liquid inlet pipe, the other water outlet joint on the water pump is connected to a No. 2 water outlet pipe, and the No. 2 water outlet pipe extends horizontally into the interior of the conical guide seat.

[0012] As a preferred embodiment of the device for preparing a lactic acid composite material described in the present invention, the front end of the device base is connected to a positioning seat, a lactide moisture detector is provided in the positioning seat, a sampling platform is provided above the lactide moisture detector, one end of the sampling platform is riveted to the purification seat, a suction fan is installed on the upper end surface of the sampling platform, the upper end of the suction fan is connected to a suction tube, and the suction tube extends to and is fixed in the interior of the purification seat.

[0013] As a preferred solution of the preparation device of a lactic acid composite material described in the present invention, wherein: the end of the long suction tube is provided with a corrugated telescopic tube, and is connected to a limited motion tube through the corrugated telescopic tube, the bottom of the limited motion tube is provided with a limited guide plate, the limited guide plate is arranged in a limited track, the lower end of the limited guide plate is provided with a tooth portion, the lower end of the tooth portion is meshed with a drive gear, the drive gear is sleeved on the output shaft of the second servo motor, and the second servo motor is horizontally fixed inside the purification seat.

[0014] As a preferred solution of the preparation device of a lactic acid composite material described in the present invention, wherein: the end of the limiting motion tube away from the corrugated telescopic tube is connected to a sealing tube sleeve, and a rotating tube is installed inside the sealing tube sleeve through an inner bearing. The tilting movement of the rotating tube acts on the sampling hole, and the sealing tube sleeve and the sampling hole are fitted and sealed. One end of the rotating tube is sleeved with an internal gear, and one side of the internal gear is meshed with an external gear, and the external gear is sleeved on the output shaft of the third servo motor. The third servo motor and the external gear are both located in the drive seat, and the drive seat is connected to the outside of the sealing tube sleeve. A suction port is provided in the middle position of the end of the rotating tube away from the internal gear, and several groups of crushing blades acting on the lactide crystals are evenly welded around the edge of the end of the rotating tube. The number of the crushing blades is preferably 2-5 groups.

[0015] As a preferred solution of the preparation device of a lactic acid composite material described in the present invention, wherein: a limited inner seat is provided inside the sampling long table and directly below the suction fan, a centrifugal weight reducer is provided inside the limited inner seat for rotation against the wall, the centrifugal weight reducer includes a rotary unloading valve, an arc-shaped weighing plate, an annular centrifugal wall, a material throwing port, a centrifugal speed-changing motor and a rotating rod, a weighing sensor is installed inside the arc-shaped weighing plate, a rotary unloading valve is provided at the center of the bottom of the arc-shaped weighing plate, and a rotary unloading valve is provided at the bottom of the limited inner seat. The detector feeding pipe corresponds to the rotary unloading valve, and the interior of the centrifugal weight reducer is provided with an annular centrifugal wall connected to the arc-shaped weighing plate. The annular centrifugal wall is provided with a material throwing port, and the outer side of the limiting inner seat is connected with a return pipe corresponding to the material throwing port. The return pipe extends toward the outside of the sampling long table and tilts into the lower position of the interior of the purification seat. The bottom center position of the arc-shaped weighing plate is connected upward with a rotating rod, and the upper end of the rotating rod is connected to a centrifugal speed-changing motor through a coupling. The centrifugal speed-changing motor is vertically mounted inside the sampling long table.

[0016] A method for preparing a lactic acid composite material comprises the following steps: S1: The lifting structure drives the lifting injection pipe to move downward, passes through the melt injection hole and enters the opening of the electric discharge plate. The drainage valve is opened, and the melt in the melting tank flows downward through the lifting injection pipe and is injected into the corresponding crystallization tank.

[0017] S2: Open the electromagnetic pulse valve, and the cold air in the gas tank passes through the mixing tube, hollow short shaft and pressure tank in turn, and is injected into the crystallization tank group through the air pressure port, and the cold air absorbs the heat of the melt.

[0018] S3: Each group of crystallization tanks moves to the discharge port position in turn, opens the control valve on the port, and the remaining liquid is discharged downward from the port into the conical guide seat.

[0019] S4: Open the electromagnetic pulse valve and the first switch valve at the same time, and the ethanol solution in the ethanol supply cylinder is injected into the mixing tube through the liquid inlet pipe. After mixing with the air, it passes through the mixing tube, the hollow short shaft and the pressure tank in turn, and is injected into the group of crystallization tanks through the air pressure port to rinse and remove impurities from the surface of the crystal.

[0020] S5: The rotating tube is in a state of linear motion and rotation. Several groups of crushing blades are used to rotate to partially crush the crystals in the crystallization tank to form a small amount of grains. The suction fan is turned on to generate suction and absorb a small amount of grains through the suction port.

[0021] S6: Open the electric unloading plate to release the crystals in the crystallization tank until all the crystals in the crystallization tank are unloaded, and take out the purified crystals from the bottom of the release guide seat.

[0022] S7: Open the electromagnetic pulse valve, and at the same time, suck the clean water in the clean water tank into the liquid inlet pipe through the No. 1 water outlet pipe, and then flow into the mixing pipe from the liquid inlet pipe, mix with the air, and pass through the mixing pipe, the hollow short shaft and the pressure tank in turn, and then be injected into the group of crystallization tanks through the air pressure port to wash the inside of the crystallization tank with water.

[0023] The present invention provides a device and method for preparing a lactic acid composite material through improvements, which have the following significant improvements and advantages compared to the prior art: The design of the blowing flow channel has three functions: opening the electromagnetic pulse valve, and the cold air in the gas tank flows through the flow channel and is injected into the group of crystallization tanks through the air pressure port, and the cold air absorbs the heat of the melt, accelerates the crystallization process, and thus improves work efficiency; at the same time, the electromagnetic pulse valve and the first switch valve are opened, and the ethanol solution in the ethanol supply cylinder is injected into the mixing pipe through the liquid inlet pipe, and has a certain impact force after mixing with the air, flows through the flow channel, and is injected into the group of crystallization tanks through the air pressure port, and the surface of the crystal is washed and impurities are removed, and the impurities are thoroughly removed by the impact force, thereby improving the impurity removal effect and reducing the amount of ethanol to achieve the purpose of saving; opening the electromagnetic pulse valve, and at the same time, the clean water in the clean water tank is sucked out and injected into the liquid inlet pipe through the No. 1 water outlet pipe, and then flows from the liquid inlet pipe into the mixing pipe, mixed with the air, flows through the flow channel, and is injected into the group of crystallization tanks through the air pressure port, and the inside of the crystallization tank is washed with water for easy use next time, thereby solving the problem of designing a cleaning device separately. The design of the cooling crystallization turntable has two functions. On the one hand, it is equipped with a spray flow channel to cool, remove impurities and clean the lactide in the crystallization tank in sequence, simplifying the structure and reducing the complexity of multiple processes of the preparation equipment. On the other hand, the large gear reduces the rotation speed and drives the cooling crystallization turntable to rotate intermittently, which can perform feeding, draining, sampling and unloading operations on the crystallization tank in turn, enriching the functions of the cooling crystallization turntable and achieving a high degree of automation. Start the second servo motor, and after a series of transmissions, the corrugated telescopic tube is extended, and the rotating tube is inserted into the sampling hole at an angle and continues to move into the through port. Then start the third servo motor, causing the internal gear to rotate, thereby causing the rotating tube to rotate around the sealing tube sleeve, forming a state in which the rotating tube moves linearly while rotating. Utilize several groups of crushing blades to perform rotational motion, and in the process of slow contact with the crystals, the crystals in the crystallization tank are partially crushed to form a small amount of grains. At this time, the sealing tube sleeve stops moving and fits with the sampling hole to achieve sealing, avoiding the problem of loose sealing. Turn on the suction fan to generate suction and use the suction port to suck a small amount of grains to achieve the purpose of automatic sampling, saving time and effort. Start the centrifugal variable speed motor, and the rotating rod drives the centrifugal weight reducer to perform centrifugal motion in the limit inner seat, so that the crystals on the arc weighing plate perform centrifugal motion along the annular centrifugal wall. When the throwing port passes the return pipe position, the slightly moving grains at this position enter the return pipe from the throwing port, and are then introduced into the release guide seat through the return pipe, so as to be reused to reduce waste until the actual weight of the grains on the arc weighing plate meets the standard. It has the function of automatic calibration of quality, and significantly improves the accuracy of moisture detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a preparation device for a lactic acid composite material according to the present invention in one direction; Figure 2 This is a schematic diagram of the overall structure of another direction of a preparation device for a lactic acid composite material of the present invention; Figure 3 Schematic diagram of the external structure of the purification seat of the present invention; Figure 4 Schematic diagram of the external structure of the conical guide seat of the present invention; Figure 5 Schematic diagram of the external connection of the annular sealing shield of the present invention; Figure 6 Schematic diagram of the transmission structure of the cooling crystallization transfer seat of the present invention; Figure 7 Schematic diagram of the external structure of the cooling crystallization transposition device of the present invention; Figure 8 It is a cross-sectional view of the cooling crystallization transposition of the present invention; Figure 9 This is a schematic diagram of the external structure of the sampling long table of the present invention; Figure 10 Schematic diagram of the specific structure of the position-limiting motion tube of the present invention; Figure 11 This is a schematic diagram of the internal structure of the sealing sleeve of the present invention; Figure 12 Schematic diagram of the internal structure of the sampling bench of the present invention.

[0025] In the figure: 1. device base; 2. device shell; 3. top platform; 4. melting tank; 5. drainage part; 6. lifting structure; 7. lifting injection pipe; 10. conical guide seat; 11. purification seat; 12. annular sealing shield; 13. melt injection hole; 14. sampling hole; 15. discharge port; 16. drain pipe; 20. cooling crystallization turntable; 21. hollow short shaft; 22. bearing seat; 23. large gear; 24. small gear; 25. first servo motor; 26. crystallization tank; 27. electric unloading plate; 28. through port; 29. ​​control valve; 30. pressure tank; 31. air pressure port; 32. solenoid valve; 33. positioning sealing bearing; 34. mixing pipe; 35. gas tank; 36. ethanol supply cylinder; 37. liquid inlet pipe; 38. installation slot; 40. clean water tank; 41. water pump; 4 2. No. 1 water outlet pipe; 43. No. 2 water outlet pipe; 50. Positioning seat; 51. Lactide moisture detector; 52. Sampling long table; 53. Suction fan; 54. Suction long tube; 60. Bellows telescopic tube; 61. Limit motion tube; 62. Toothed portion; 63. Driving gear; 64. Second servo motor; 65. Sealing pipe sleeve; 66. Driving seat; 67. Limit guide plate; 70. Rotating tube; 71. Inner bearing; 72. Inner gear; 73. Outer gear; 74. Third servo motor; 76. Suction port; 77. Crushing blade; 80. Limit inner seat; 81. Centrifugal weight reducer; 82. Rotary unloading valve; 83. Arc weighing plate; 84. Annular centrifugal wall; 85. Throwing port; 90. Detector feeding pipe; 91. Return pipe; 92. Centrifugal variable speed motor; 93. Rotating rod. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0027] like Figures 1-8 As shown, this embodiment provides a preparation device for a lactic acid composite material, including a device base 1, the edge of the device base 1 is connected to a top platform 3 through a device shell 2, a melting tank 4 is provided in the middle position of the top platform 3, the melting tank 4 is fixed by a drainage part 5 and the inside of the top platform 3, the lower end of the drainage part 5 is connected to a lifting injection pipe 7, a drainage valve is provided at the connection position of the drainage part 5 and the lifting injection pipe 7, which opens and closes automatically, and a lifting structure 6 (preferably a screw lifting structure) is installed on the lifting injection pipe 7, and the lifting structure 6 drives the lifting injection pipe 7 to move up and down.

[0028] Furthermore, a conical guide seat 10 is fixed in the middle of the device base 1, and a sealing door is movably provided on the side of the conical guide seat 10. The lower end of the conical guide seat 10 passes through the device base 1 and is connected to a sewage pipe 16. The upper end of the sewage pipe 16 is provided with a sewage valve, which is automatically opened and closed. Figures 1-4 shown.

[0029] The upper end of the conical guide seat 10 is connected to the purification seat 11, and the inner part of the purification seat 11 is riveted upward with an annular sealing shield 12. The top of the annular sealing shield 12 is provided with a melt injection hole 13 for inserting the lifting injection pipe 7. Figure 3 and Figure 4 shown.

[0030] Among them, the annular sealing shield 12 has a sampling hole 14 at the front upper corner, and a discharge port 15 is opened at the bottom of the annular sealing shield 12. Figure 5 and Figure 6 shown.

[0031] Furthermore, a cooling crystallization rotating seat 20 is provided inside the annular sealing shield 12 so as to rotate against the wall. A hollow short shaft 21 is installed at the middle position on both sides of the cooling crystallization rotating seat 20 (at least one set of hollow short shafts 21 is ensured to be hollow inside). Both sets of hollow short shafts 21 are connected to the inner wall of the annular sealing shield 12 through a bearing seat 22. Figure 7 and Figure 8 shown.

[0032] In this embodiment, one of the hollow short shafts 21 extends outward and is sleeved with a large gear 23. The lower end of the large gear 23 is meshed with a small gear 24. The small gear 24 is sleeved on the output shaft of the first servo motor 25. The first servo motor 25 is horizontally fixed inside the purification seat 11. Figure 6 and Figure 7 shown.

[0033] Furthermore, the annular surface of the cooling crystallization turntable 20 is evenly provided with a plurality of groups of crystallization grooves 26, and a card step is provided at the notch of the crystallization groove 26, and an electric unloading plate 27 is sealed and installed on the card step, forming a tight sealing relationship between the two. A through hole 28 is provided in the middle of the electric unloading plate 27, and a control valve 29 is installed in the through hole 28, which is automatically opened and closed. Figure 7 and Figure 8 shown.

[0034] In this embodiment, a pressure groove 30 connected to one group of hollow short shafts 21 is provided in the middle position of the cooling crystallization turntable 20, and an air pressure port 31 is provided between the pressure groove 30 and each group of crystallization grooves 26. An electromagnetic valve 32 is installed on the air pressure port 31, which opens and closes automatically. A group of hollow short shafts 21 away from the large gear 23 extends outward and is connected to the positioning seal bearing 33. The positioning seal bearing 33 is fixed in the mounting groove 38. The mounting groove 38 is provided on the left side of the upper end surface of the purification seat 11. Figure 5 and Figure 8 shown.

[0035] Furthermore, one end of the positioning sealing bearing 33 away from the hollow short shaft 21 is connected to a mixing tube 34, and one end of the mixing tube 34 away from the positioning sealing bearing 33 is connected to a gas tank 35 located in the mounting groove 38. An electromagnetic pulse valve is installed at the connection position between the gas tank 35 and the mixing tube 34. The upper end of the mixing tube 34 is connected to a liquid inlet pipe 37, and the upper end of the liquid inlet pipe 37 is connected to an ethanol liquid supply cylinder 36. The ethanol liquid supply cylinder 36 is installed on the upper end surface of the purification seat 11 through a bracket. The bottom of the ethanol liquid supply cylinder 36 is provided with a first switch valve, which is automatically opened and closed. Figure 5-Figure 8 shown.

[0036] Among them, a clean water tank 40 is provided on the left side of the upper end surface of the device base 1, and a water pump 41 is installed on the upper end of the clean water tank 40. One of the water outlet joints on the water pump 41 is connected to a No. 1 water outlet pipe 42, which extends upward and is connected to the liquid inlet pipe 37. Another water outlet joint on the water pump 41 is connected to a No. 2 water outlet pipe 43, which extends horizontally into the interior of the conical guide seat 10. The end of the No. 2 water outlet pipe 43 is provided with a spray head, such as Figures 1-4 shown.

[0037] When this embodiment is in use, the crude lactide to be purified is placed in the melting tank 4, heated to become a melt, and then the lifting structure 6 drives the lifting injection pipe 7 to move downward, passes through the melt injection hole 13 and enters the opening 28 of the electric unloading plate 27, and the drainage valve is opened. The melt in the melting tank 4 flows downward through the lifting injection pipe 7 and is injected into the corresponding crystallization tank 26. After a certain amount is injected, the drainage valve is closed, and the lifting structure 6 drives the lifting injection pipe 7 to move upward and return to its position. Then, the first servo motor 25 is started, and the small gear 24 rotates and drives the large gear 23 to decelerate through engagement, thereby driving the cooling crystallization turntable 20 to rotate intermittently. Each group of crystallization tanks 26 moves to the position of the melt injection hole 13 (i.e., the top of the cooling crystallization turntable 20) in turn, and an equal amount of melt is injected according to the above operation.

[0038] When the crystallization tank 26 carrying the melt moves to the position of the discharge port 15 (i.e., the bottom of the cooling crystallization turntable 20), the electromagnetic pulse valve is opened, and the cold air in the gas tank 35 passes through the mixing pipe 34, the hollow short shaft 21 and the pressure tank 30 in turn, and is injected into the group of crystallization tanks 26 through the air pressure port 31 (when the electromagnetic valve 32 at the top of the group of crystallization tanks 26 is open). The cold air absorbs the heat of the melt and accelerates the crystallization process. In addition, each group of crystallization tanks 26 passes through the position of the discharge port 15 in turn, and is injected with cold air in turn for cooling.

[0039] When the melt in the crystallization tank 26 is completely crystallized, each group of crystallization tanks 26 moves to the discharge port 15 position in turn, first open the control valve 29 on the port 28, and the remaining liquid is discharged downward from the port 28 into the conical guide seat 10, then open the electromagnetic pulse valve and the first switch valve at the same time, and the ethanol solution in the ethanol supply cylinder 36 is injected into the mixing pipe 34 through the liquid inlet pipe 37, and after mixing with the air (with a certain impact force), it passes through the mixing pipe 34, the hollow short shaft 21 and the pressure tank 30 in sequence. The air pressure port 31 is used to inject the waste liquid into the group of crystallization tanks 26 to rinse and remove impurities from the surface of the crystals. The waste liquid is discharged downward from the port 28 into the conical guide seat 10. The flushing and drainage of the crystals in all the crystallization tanks 26 are completed in turn. The drain valve is opened to release the waste liquid in the conical guide seat 10 and drain it outward through the drain pipe 16. Then, the water pump 41 is started to suck the clean water in the clean water tank 40 and inject it into the release conical guide seat 10 through the No. 2 outlet pipe 43 to clean the interior and dry it immediately.

[0040] Then the inside of the conical guide seat 10 is dried and released, and each group of crystallization tanks 26 moves to the discharge port 15 position in turn, and the electric unloading plate 27 is opened (the electric unloading plate 27 flips over and enters the discharge port 15) to release the crystals in the crystallization tank 26 until all the crystals in the crystallization tank 26 are unloaded, and the purified crystals are taken out from the bottom of the released conical guide seat 10, and then the electromagnetic pulse valve is opened, and at the same time, the clean water in the clean water tank 40 is sucked into the liquid inlet pipe 37 through the No. 1 water outlet pipe 42, and flows from the liquid inlet pipe 37 into the mixing pipe 34, mixed with air (with a certain impact force), and passes through the mixing pipe 34, the hollow short shaft 21 and the pressure tank 30 in turn, and is injected into the group of crystallization tanks 26 through the air pressure port 31, and the inside of the crystallization tank 26 is washed with water for easy use next time. The waste water is also discharged to the outside through the sewage pipe 16. Example

[0041] like Figures 1-12As shown, the front end of the device base 1 is connected to a positioning seat 50, and a lactide moisture detector 51 is arranged in the positioning seat 50 (a conventional Karl Fischer moisture detector can be selected), and a sampling platform 52 is arranged above the lactide moisture detector 51. One end of the sampling platform 52 is riveted to the purification seat 11, and a suction fan 53 is installed on the upper end surface of the sampling platform 52. The upper end of the suction fan 53 is connected to a suction tube 54, and the suction tube 54 extends to the interior of the purification seat 11 and is fixed.

[0042] Furthermore, a bellows telescopic tube 60 is provided at the end of the long suction tube 54. The bellows telescopic tube 60 has a telescopic deformation reset performance and is connected to a limited motion tube 61 through the bellows telescopic tube 60. A limited guide plate 67 is provided at the bottom of the limited motion tube 61. The limited guide plate 67 is provided in the limited track. Figure 9 and Figure 10 shown.

[0043] Among them, the lower end of the limiting guide plate 67 is provided with a tooth portion 62, and the lower end of the tooth portion 62 is meshed with a driving gear 63, and the driving gear 63 is sleeved on the output shaft of the second servo motor 64, and the second servo motor 64 is horizontally fixed inside the purification seat 11, as shown Figure 10 shown.

[0044] Furthermore, the end of the position-limiting movement tube 61 away from the bellows telescopic tube 60 is connected to a sealing sleeve 65, and a rotating tube 70 is installed inside the sealing sleeve 65 through an inner bearing 71. The rotating tube 70 is connected to the position-limiting movement tube 61. The tilting movement of the rotating tube 70 acts on the sampling hole 14, and the sealing sleeve 65 and the sampling hole 14 are in close contact and sealed. Figure 10 and Figure 11 shown.

[0045] Among them, one end of the rotating tube 70 is sleeved with an internal gear 72, and one side of the internal gear 72 is meshed with an external gear 73, and the external gear 73 is sleeved on the output shaft of the third servo motor 74. The third servo motor 74 and the external gear 73 are both located in the drive seat 66, and the drive seat 66 is connected to the outside of the sealing sleeve 65, as shown in FIG. Figure 10 and Figure 11 shown.

[0046] Among them, a suction port 76 is opened in the middle position of one end of the rotating tube 70 away from the internal gear 72. Several groups of crushing blades 77 acting on the lactide crystals are evenly welded around the edge of the end of the rotating tube 70. The specific shape of the crushing blades 77 is designed according to actual conditions, such as Figure 11 shown.

[0047] Furthermore, a limited inner seat 80 is provided inside the sampling long table 52 and directly below the suction fan 53. A centrifugal weight reducer 81 is provided inside the limited inner seat 80 so as to rotate against the wall. Figure 12 shown.

[0048] Specifically, the centrifugal weight reducer 81 includes a rotary discharge valve 82, an arc-shaped weighing plate 83, an annular centrifugal wall 84, a material ejection port 85, a centrifugal variable speed motor 92 and a rotating rod 93. Figure 9 and 12 shown.

[0049] In this embodiment, the arc-shaped weighing plate 83 is an inwardly concave arc surface, and a weighing sensor is installed inside the arc-shaped weighing plate 83. A rotary discharge valve 82 is provided at the center position of the bottom of the arc-shaped weighing plate 83. The rotary discharge valve 82 opens and closes multiple valve ports through rotational motion. A detector feeding pipe 90 corresponding to the rotary discharge valve 82 is installed at the bottom of the limiting inner seat 80. An annular centrifugal wall 84 connected to the arc-shaped weighing plate 83 is provided inside the centrifugal weight reducer 81, and a material rejection port 85 is provided on the annular centrifugal wall 84. The outer side of the limiting inner seat 80 is connected to a return pipe 91 corresponding to the material rejection port 85. The return pipe 91 extends toward the outer side of the sampling long table 52 and tilts into the lower position inside the purification seat 11.

[0050] In this embodiment, a rotating rod 93 is connected upwardly to the center of the bottom of the arc-shaped weighing plate 83, and the upper end of the rotating rod 93 is connected to a centrifugal speed-changing motor 92 through a coupling. The centrifugal speed-changing motor 92 is vertically mounted inside the sampling long table 52.

[0051] When the present embodiment is in use, after the crystals in each group of crystallization tanks 26 are rinsed, the crystallization tanks 26 are moved to the position of the sampling hole 14 in a single group or in turns (depending on the frequency and needs of sampling), the second servo motor 64 is first started to drive the driving gear 63 to rotate, and the limiting guide plate 67 is caused to move linearly in the limiting track through meshing, so that the bellows telescopic tube 60 is extended, and the rotating tube 70 is tilted and inserted into the sampling hole 14 and continues to move into the through port 28. Then the third servo motor 74 is started, the outer gear 73 rotates and causes the inner gear 72 to rotate through meshing, so that The rotating tube 70 rotates around the sealing tube sleeve 65, forming a state in which the rotating tube 70 moves linearly and rotates at the same time. A number of groups of crushing blades 77 are used to perform rotational motion. In the process of slowly contacting the crystals, the crystals in the crystallization tank 26 are partially crushed to form a small number of grains. At this time, the sealing tube sleeve 65 stops moving and fits with the sampling hole 14 to achieve sealing. The suction fan 53 is turned on to generate suction and use the suction port 76 to suck a small amount of grains. The grains pass through the rotating tube 70, the limiting motion tube 61 and the corrugated telescopic tube 60 in turn, and are transported to the sampling long table 52 using the long suction tube 54.

[0052] The grains in the sampling long table 52 fall into the centrifugal weight reducer 81, and the actual weight of the grains is measured by the weighing sensor on the arc-shaped weighing plate 83 (the amount of grains absorbed is greater than the required standard weight, so a part of it needs to be discharged outward), and then the centrifugal speed-changing motor 92 is started, and the rotating rod 93 drives the centrifugal weight reducer 81 to perform centrifugal motion in the limit inner seat 80, so that the crystals on the arc-shaped weighing plate 83 perform centrifugal motion along the annular centrifugal wall 84. When the ejection port 85 passes the position of the return pipe 91, the slightly moving grains at this position enter the return pipe 91 from the ejection port 85, and are then introduced into the release conical guide seat 10 through the return pipe 91 for reuse to reduce waste.

[0053] When the actual weight of the grains on the arc-shaped weighing plate 83 meets the standard, the rotary discharge valve 82 is opened, and the grains on the arc-shaped weighing plate 83 roll off from the multiple valve ports of the rotary discharge valve 82 and are injected into the lactide moisture detector 51 through the detector feeding pipe 90. The moisture is then allowed to react quantitatively with the reagent, and the moisture content of the purified lactide is calculated based on the amount of electricity consumed during the electrolysis process.

[0054] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing a lactic acid composite material, comprising a device base (1), characterized in that: A conical guide seat (10) is fixed in the middle position of the device base (1), the upper end of the conical guide seat (10) is connected to the purification seat (11), an annular sealing shield (12) is riveted upward inside the purification seat (11), a melt injection hole (13) for inserting the lifting injection pipe (7) is provided at the top of the annular sealing shield (12), a sampling hole (14) is provided at the front upper corner of the annular sealing shield (12), and a discharge port (15) is provided at the bottom of the annular sealing shield (12); A cooling crystallization rotating seat (20) is provided inside the annular sealing shield (12) so as to rotate against the wall. A hollow short shaft (21) is installed at the middle position of both sides of the cooling crystallization rotating seat (20). A plurality of groups of crystallization grooves (26) are evenly provided on the annular surface seat of the cooling crystallization rotating seat (20). A step is provided at the notch of the crystallization groove (26). An electric discharge plate (27) is sealed and installed on the step. A through port (28) is provided in the middle of the electric discharge plate (27). A control valve (29) is installed in the through port (28). A pressure groove (30) is provided in the middle of the cooling crystallization turntable (20) and is connected to one of the hollow short shafts (21). An air pressure port (31) is provided between the pressure groove (30) and each group of crystallization grooves (26). A solenoid valve (32) is installed on the air pressure port (31). A group of hollow short shafts (21) away from the large gear (23) extends outward and is connected to a positioning seal bearing (33). One end of the positioning seal bearing (33) away from the hollow short shaft (21) is connected to a mixing pipe (34). One end of the mixing pipe (34) away from the positioning seal bearing (33) is connected to a gas tank (35) located in the installation groove (38). The upper end of the mixing pipe (34) is connected to a liquid inlet pipe (37). The upper end of the liquid inlet pipe (37) is connected to an ethanol liquid supply cylinder (36). The middle part of the liquid inlet pipe (37) is connected to the first water outlet pipe (42).

2. The device for preparing a lactic acid composite material according to claim 1, characterized in that: The edge of the device base (1) is connected to a top platform (3) through the device housing (2); a molten tank (4) is provided in the middle of the top platform (3); the molten tank (4) is fixed through the drainage portion (5) and the interior of the top platform (3); the lower end of the drainage portion (5) is connected to a lifting injection pipe (7); a lifting structure (6) is installed on the lifting injection pipe (7); and the lifting structure (6) drives the lifting injection pipe (7) to move up and down.

3. The device for preparing a lactic acid composite material according to claim 1, characterized in that: The two groups of hollow short shafts (21) are connected through the bearing seat (22) and the inner wall of the annular sealing shield (12), and one group of the hollow short shafts (21) extends outward and is sleeved with a large gear (23), and the lower end of the large gear (23) is meshed with a small gear (24), and the small gear (24) is sleeved on the output shaft of the first servo motor (25), and the first servo motor (25) is horizontally fixed inside the purification seat (11); The positioning seal bearing (33) is fixed in the mounting groove (38), an electromagnetic pulse valve is installed at the connection position between the gas tank (35) and the mixing pipe (34), the ethanol liquid supply cylinder (36) is installed on the upper end surface of the purification seat (11) through a bracket, and a first switch valve is provided at the bottom of the ethanol liquid supply cylinder (36).

4. The device for preparing a lactic acid composite material according to claim 3, characterized in that: A clean water tank (40) is provided on the left side of the upper end surface of the device base (1). A water pump (41) is installed on the upper end of the clean water tank (40). One of the water outlet joints on the water pump (41) is connected to a first water outlet pipe (42). The first water outlet pipe (42) extends upward and is connected to the liquid inlet pipe (37). The other water outlet joint on the water pump (41) is connected to a second water outlet pipe (43). The second water outlet pipe (43) extends horizontally into the interior of the conical guide seat (10).

5. The device for preparing a lactic acid composite material according to claim 1, characterized in that: The front end of the device base (1) is connected to a positioning seat (50), a lactide moisture detector (51) is arranged in the positioning seat (50), a sampling platform (52) is arranged above the lactide moisture detector (51), one end of the sampling platform (52) is riveted to the purification seat (11), a suction fan (53) is installed on the upper end surface of the sampling platform (52), the upper end of the suction fan (53) is connected to a suction tube (54), and the suction tube (54) extends into the interior of the purification seat (11) and is fixed.

6. The device for preparing a lactic acid composite material according to claim 5, characterized in that: The end of the long material suction tube (54) is provided with a corrugated telescopic tube (60), and is connected to a limited motion tube (61) through the corrugated telescopic tube (60). A limited guide plate (67) is provided at the bottom of the limited motion tube (61). The limited guide plate (67) is arranged in a limited track. The lower end of the limited guide plate (67) is provided with a tooth portion (62). The lower end of the tooth portion (62) is meshed with a driving gear (63). The driving gear (63) is sleeved on the output shaft of the second servo motor (64).

7. The device for preparing a lactic acid composite material according to claim 6, characterized in that: The end of the limiting motion tube (61) away from the bellows telescopic tube (60) is connected to a sealing tube sleeve (65), and the interior of the sealing tube sleeve (65) is equipped with a rotating tube (70) through an inner bearing (71). The rotating tube (70) acts on the sampling hole (14) by tilting motion. The sealing tube sleeve (65) and the sampling hole (14) are fitted and sealed. One end of the rotating tube (70) is sleeved with an internal gear (72), and one side of the internal gear (72) is meshed with an external gear (73). The external gear (73) is sleeved on the output shaft of the third servo motor (74). A suction port (76) is opened in the middle position of one end of the rotating tube (70) away from the internal gear (72). Several groups of crushing blades (77) acting on lactide crystals are uniformly welded around the edge of the end of the rotating tube (70).

8. The device for preparing a lactic acid composite material according to claim 5, characterized in that: A limited inner seat (80) is provided inside the sampling long table (52) and directly below the suction fan (53). A centrifugal weight reducer (81) is provided inside the limited inner seat (80) so as to rotate against the wall. The centrifugal weight reducer (81) comprises a rotary discharge valve (82), an arc-shaped weighing plate (83), an annular centrifugal wall (84) and a material ejection port (85). A weighing sensor is installed inside the arc-shaped weighing plate (83). A rotary discharge valve (82) is provided at the center of the bottom of the arc-shaped weighing plate (83). A detector feeding pipe (90) corresponding to the rotary discharge valve (82) is installed at the bottom of the inner seat (80), and an annular centrifugal wall (84) connected to the arc-shaped weighing plate (83) is provided inside the centrifugal weight reducer (81), and a material discharge port (85) is provided on the annular centrifugal wall (84). The outer side of the limiting inner seat (80) is connected to a return pipe (91) corresponding to the material discharge port (85), and the return pipe (91) extends toward the outer side of the sampling long table (52) and tilts into the lower position inside the purification seat (11).

9. The device for preparing a lactic acid composite material according to claim 8, characterized in that: The centrifugal weight reducer (81) further includes a centrifugal speed-changing motor (92) and a rotating rod (93). The rotating rod (93) is connected upwardly to the center of the bottom of the arc-shaped weighing plate (83). The upper end of the rotating rod (93) is connected to the centrifugal speed-changing motor (92) via a coupling. The centrifugal speed-changing motor (92) is vertically mounted inside the sampling long table (52).

10. A method for preparing a lactic acid composite material, applied to a device for preparing a lactic acid composite material according to any one of claims 1 to 9, characterized in that The following steps are involved: S1: The lifting structure (6) drives the lifting injection pipe (7) to move downward, passes through the melt injection hole (13) and enters the opening (28) of the electric discharge plate (27), opens the drainage valve, and the melt in the melting tank (4) flows downward through the lifting injection pipe (7) and is injected into the corresponding crystallization tank (26); S2: The electromagnetic pulse valve is opened, and the cold air in the gas tank (35) passes through the mixing tube (34), the hollow short shaft (21) and the pressure tank (30) in sequence, and is injected into the crystallization tank (26) through the air pressure port (31), and the cold air absorbs the heat of the melt; S3: Each group of crystallization tanks (26) moves to the discharge port (15) position in turn, opens the control valve (29) on the port (28), and the remaining liquid is discharged downward from the port (28) into the conical guide seat (10); S4: The electromagnetic pulse valve and the first switch valve are opened simultaneously, and the ethanol solution in the ethanol supply cylinder (36) is injected into the mixing tube (34) through the liquid inlet pipe (37), mixed with air, and then sequentially passes through the mixing tube (34), the hollow short shaft (21) and the pressure tank (30), and is injected into the crystallization tank (26) through the air pressure port (31) to rinse and remove impurities from the surface of the crystal; S5: The rotating tube (70) rotates while moving linearly, and utilizes a plurality of groups of crushing blades (77) to perform rotational motion, thereby partially crushing the crystals in the crystallization tank (26) to form a small amount of grains. The suction fan (53) is turned on to generate suction force to absorb a small amount of grains through the suction port (76); S6: Open the electric discharge plate (27) to release the crystals in the crystallization tank (26) until all the crystals in the crystallization tank (26) are discharged, and take out the purified crystals from the bottom of the release conical guide seat (10); S7: Open the electromagnetic pulse valve and simultaneously draw clean water from the clean water tank (40) and inject it into the liquid inlet pipe (37) through the No. 1 water outlet pipe (42). The clean water flows from the liquid inlet pipe (37) into the mixing pipe (34), mixes with the air, and passes through the mixing pipe (34), the hollow short shaft (21) and the pressure tank (30) in sequence. The clean water is injected into the crystallization tank (26) through the air pressure port (31) to wash the inside of the crystallization tank (26).

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