Hydrothermal hardening PHA straw extrusion device and use method

Abstract

The invention discloses a hydro-thermal hardening PHA straw extrusion device and a using method, and relates to the field of PHA straw extrusion devices, the hydro-thermal hardening PHA straw extrusion device comprises an extrusion assembly, the extrusion assembly comprises two extrusion pipes which are symmetrically and obliquely arranged, the outer walls of the extrusion pipes are movably connected with heating assemblies, and the bottoms of the extrusion pipes are connected with a supporting frame through bolts. The extrusion pipe is obliquely arranged, so that the screw rod can uniformly stir a PHA raw material in a molten state, water vapor in the PHA raw material is released, and the problem that the water vapor in the melt cannot be rapidly discharged due to the fact that the viscosity and the surface tension of the PHA raw material in the molten state are high is solved; and the water vapor can be intensively discharged into the condensation assembly from the exhaust hole, so that the problem that the water vapor cannot be quickly discharged and finally bubbles are formed in the suction pipe is solved.

Description

Technical Field

[0001] The invention relates to the technical field of PHA straw extrusion devices, and in particular to a hydrothermal hardening PHA straw extrusion device and a use method thereof. Background Art

[0002] PHA straws are biodegradable straws made of PHA materials. After the PHA material is processed, it is sent to the extrusion device for extrusion molding.

[0003] For example, the "online extrusion method of polylactic acid straws" with publication number CN117774255A includes the following steps: ① using L-lactide with a purity of more than 98% to carry out lactide polymerization reaction, the catalyst concentration is 0.5%, the reaction temperature is 160°-170°, and the reaction time is 30 hours to obtain a high-purity L-lactide melt with a purity of more than 98%; ② conveying the high-purity L-lactide melt and the modified ingredients to a twin-screw extruder for blending and modification treatment, and processing The temperature is 200° and the speed is 400 rpm; ③ the twin-screw extruder is directly connected to the single-screw straw extruder, and the modified material directly enters the single-screw straw extruder from the twin-screw extruder to extrude the straws; ④ the straws enter the online heat treatment unit, and the online heat treatment unit includes a constant temperature water tank and a constant temperature drying tunnel which are sequentially connected to the extrusion port of the single-screw straw extruder. After extrusion, the straws directly enter the constant temperature water tank, and then enter the constant temperature drying tunnel to be shaped to obtain heat-resistant straws; ⑤ the heat-resistant straws are cut and packaged.

[0004] However, in the prior art, PHA raw materials absorb a certain amount of moisture during the production and storage process. Despite the subsequent separation and drying steps, it is difficult to completely remove the moisture. Even at the drying level that meets industrial standards, it still contains a small amount of moisture (0.1%-0.5%). When extruding the PHA straw raw material, the extruder first heats the PHA raw material to a molten state through a heating system. During the heating process, the moisture contained in the PHA raw material will be evaporated, and water vapor will be generated after the water evaporates. Since the PHA straw has a certain strength and toughness, it can withstand a certain degree of external force without breaking or deforming. Therefore, the melt of the PHA raw material will have corresponding viscosity and surface tension. The strong viscosity and surface tension will cause the water vapor in the melt to not be discharged quickly, but to be wrapped inside the melt, and finally be extruded together with the melt, eventually forming bubbles inside the straw. Summary of the invention

[0005] The object of the present invention is to provide a hydrothermal hardening PHA straw extrusion device and a method of use, so as to solve the problem mentioned in the background art that the strong viscosity and surface tension of the PHA raw material melt will cause the water vapor in the melt to not be discharged quickly, but to be wrapped inside the melt, and finally be extruded together with the melt, eventually forming bubbles inside the straw.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hydrothermally hardened PHA straw extrusion device, comprising an extrusion assembly, wherein the extrusion assembly comprises two symmetrically inclined extrusion tubes, wherein the inclination angle of the extrusion tubes is set between 40 and 50 degrees, a heating assembly is movably connected to the outer wall of the extrusion tube, and the bottom of the extrusion tube is connected to a support frame by bolts, and the extrusion ports of the two extrusion tubes are detachably connected with an extrusion assembly and a condensation assembly wrapped around the outer wall thereof, wherein the condensation assembly is used to collect water vapor, and a heat dissipation assembly is fixedly connected to the top of the condensation assembly, and a flange is provided at the intersection of the extrusion assembly and the extrusion tube;

[0007] The extrusion assembly includes a docking block and a discharge block, the discharge block and the docking block are fixedly connected, the cross-sections of the docking block and the discharge block are T-shaped with both ends bent, a feed chamber is provided inside the docking block, the feed chamber is connected to the extrusion tube, a discharge chamber is provided inside the discharge block, the discharge chamber is connected to the feed chamber, an extrusion chamber is provided at the junction of the discharge chamber and the feed chamber, the extrusion chamber is in a horizontal state, the discharge chamber and the extrusion chamber are perpendicular to each other, a vertically upward exhaust hole is provided on the top of the docking block, the exhaust holes are arranged in a matrix, and a gas-liquid separation membrane for blocking the PHA raw material melt is provided inside the exhaust hole;

[0008] The bottom of the discharging block is fixedly connected with an arc-shaped pipe, the other end of the arc-shaped pipe is fixedly connected with a cooling trough, an electric heating rod is placed inside the cooling trough, and blocking blocks are fixedly installed at both ends of the inner wall of the cooling trough.

[0009] Preferably, the condensation assembly includes a splicing block, and connecting blocks are fixedly installed on the outer walls of the two splicing blocks. The two splicing blocks are spliced ​​together outside the docking block to form a shell for collecting water vapor, and the two connecting blocks are connected by a threaded rod.

[0010] Preferably, an extension block is fixedly connected to the bottom of the splicing block, and the extension block is sleeved on the outer wall of the discharge block. A clamping block is fixedly installed at the junction of the splicing block and the extension block. The cross-section of the clamping block is arrow-shaped, and the protruding part of the clamping block is clamped at the junction of the docking block and the discharge block.

[0011] Preferably, a strap is fixedly mounted on the inner wall of the splicing block, the strap is overlapped on the upper surface of the docking block, the exhaust hole is located between the two straps, and a gap with a width equal to the range of the exhaust hole is left between the two straps.

[0012] Preferably, one end of the strap is fixedly connected to a curved plate, a gap for water vapor flow is left between the two curved plates, the bending direction of the curved plate is toward the top of the splicing block, the angle between the curved plate and the strap is between one hundred and twenty degrees and one hundred and thirty degrees, and a gap with a width of the strap thickness is left between the highest point of the curved plate and the splicing block.

[0013] Preferably, a collecting chamber is provided inside the splicing block, a diverter protrusion is fixedly installed on the inner wall of the collecting chamber, the diverter protrusion is located at the midpoint between the two arc-shaped plates, the collecting chamber is connected to the exhaust hole, a gathering chamber is provided inside the extension block, and the bottom of the collecting chamber is connected to a reflux chamber.

[0014] Preferably, the heat dissipation assembly includes a fixed frame and a radiator, a strip hole is opened at the edge of the fixed frame, the edge of the radiator is fixedly connected to the inner wall of the fixed frame, and the contact sheets in the radiator are fixedly connected to both sides of the top of the splicing block.

[0015] Preferably, a reduction motor is fixedly mounted on the upper surface of the support frame, and the output end of the reduction motor is movably connected to a belt transmission assembly, and the other end of the belt transmission assembly is movably connected to a spiral rod in the extrusion tube, and a discharge port is opened at one end of the extrusion tube, and a bending tube is fixedly connected to the top of the discharge port, and a discharge barrel is fixedly connected to the other end of the bending tube, and a limiting ring is fixedly mounted on the outer wall of the extrusion tube.

[0016] Preferably, the heating assembly includes an electric heating plate, which is sleeved on the outer wall of the extruded tube and located between two limit rings. The bottom of the electric heating plate is rotatably connected to a positioning block, the top of the support frame is fixedly installed with a wire management plate, and the wiring terminal of the electric heating plate is fixedly connected to an electric control cabinet.

[0017] A method for using a hydrothermally hardened PHA straw extrusion device comprises the following steps:

[0018] S1. Pour the PHA raw material into the discharge barrel, and the PHA raw material falls into the inside of the extrusion tube through the discharge port. Then start the reduction motor, which drives the screw rod in the extrusion tube through the belt transmission assembly. When the screw rod rotates, it pushes the PHA raw material to the extrusion port at the other end of the extrusion tube;

[0019] S2. During the extrusion process, the electric heating plate is controlled by the electric control cabinet to heat the PHA raw material in the extrusion tube. As the screw rotates, the PHA raw material gradually melts at high temperature to form a uniform molten plastic. The heating temperature is controlled between 160°C and 180°C, and the screw speed is controlled between 30 and 100 rpm.

[0020] S3, the molten PHA raw material enters the feed chamber from the extruder port, and then flows out from the discharge chamber. During this process, the radiator is turned on to continuously dissipate heat from the condensation component;

[0021] S4. After extrusion, the PHA straws go into the cooling tank along the curved pipe. The electric heating rod in the cooling tank heats the cooling water to between 60℃ and 70℃, and the hardness of the straws is improved through high-temperature crystallization treatment.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, the extrusion tube is tilted and gravity is used to make the molten PHA raw material in the extrusion tube have a tendency to fall. However, the screw rod in the extrusion tube is always conveying the molten PHA raw material. The molten PHA raw material with a tendency to fall will produce greater friction with the screw rod, so that the screw rod can stir the molten PHA raw material and release the water vapor inside it, thereby solving the problem that the water vapor in the melt cannot be quickly discharged due to the strong viscosity and surface tension of the molten PHA raw material. The released water vapor will be subsequently conveyed to the extrusion assembly together with the molten PHA raw material. The molten PHA raw material in the extrusion assembly will be concentrated in the discharge chamber. In this process, the molten PHA raw materials entering at both ends will squeeze each other to press out the residual water vapor inside, and the water vapor will be concentrated and discharged from the exhaust hole to the condensation assembly, thereby solving the problem that the water vapor cannot be quickly discharged and eventually bubbles are formed inside the straw.

[0024] 2. In the present invention, a condensation component is arranged above the extrusion component. The splicing block in the condensation component is directly coated on the outer wall of the docking block. The water vapor separated from the molten PHA raw material will enter the collection chamber, and will be liquefied into condensed water after being cooled by the heat dissipation component. Also under the action of gravity, the condensed water will flow into the reflux chamber and the gathering chamber. These condensed waters will surround the outer wall of the discharge block to absorb heat, thereby reducing the temperature in the discharge chamber. The gathering chamber is connected to the collection chamber, and the heat absorbed by the condensed water can also be discharged by the heat dissipation component, so that the entire condensation component is always kept at a relatively low temperature.

[0025] 3. In the present invention, arc plates and diverter protrusions are provided in the splicing block to guide the flow direction of water vapor. By guiding the water vapor to flow obliquely, it will not be re-injected into the extrusion chamber, thereby avoiding the secondary mixing of water vapor and molten PHA raw materials. In addition, the main formation area of ​​cold water is located on both sides of the diverter protrusion. The diverter protrusion can not only guide the flow direction of water vapor, but also ensure that the condensed water will eventually drip onto the arc plate, and then flow into the reflux chamber and the gathering chamber, completely avoiding the problem of condensed water dripping back into the extrusion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of a hydrothermal hardening PHA straw extrusion device of the present invention;

[0027] Figure 2 A top view of a hydrothermally hardened PHA straw extrusion device according to the present invention;

[0028] Figure 3 It is a schematic structural diagram of an extrusion tube, an extrusion assembly, a condensation assembly and a heat dissipation assembly of a hydrothermally hardened PHA straw extrusion device of the present invention;

[0029] Figure 4 It is a schematic diagram of a half-section structure of an extrusion component, a condensation component and a heat dissipation component of a hydrothermally hardened PHA straw extrusion device of the present invention;

[0030] Figure 5 It is a schematic diagram of the planar structure of an extrusion component and a condensation component of a hydrothermally hardened PHA straw extrusion device of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of a partial condensation component and an extrusion component of a hydrothermally hardened PHA straw extrusion device of the present invention;

[0032] Figure 7 It is a schematic diagram of the internal structure of an extrusion assembly of a hydrothermally hardened PHA straw extrusion device of the present invention;

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of an extrusion component and a heating component of a hydrothermal hardening PHA straw extrusion device of the present invention;

[0034] Fig. 9 A schematic diagram of the raw material extrusion direction of a hydrothermal hardening PHA straw extrusion device of the present invention;

[0035] Fig.10 A schematic diagram of force analysis inside an extrusion tube of a hydrothermally hardened PHA straw extrusion device of the present invention;

[0036] Fig.11A schematic diagram of the flow of raw materials and water vapor in an extrusion assembly of a hydrothermally hardened PHA straw extrusion device according to the present invention;

[0037] Fig.12 This is a schematic diagram of the flow of water vapor in a condensing component of a hydrothermally hardened PHA straw extrusion device of the present invention.

[0038] In the figure: 1. Support frame; 2. Extrusion assembly; 3. Electric control cabinet; 4. Heating assembly; 5. Extrusion assembly; 6. Condensation assembly; 7. Heat dissipation assembly; 8. Cooling trough; 9. Arc pipe; 10. Electric heating rod; 11. Block block; 21. Speed ​​reduction motor; 22. Belt drive assembly; 23. Extrusion tube; 24. Feed barrel; 25. Bending tube; 26. Flange; 27. Feed port; 28. Limiting ring; 41. Electric heating plate; 42. Positioning block ; 43. Wire management plate; 51. Docking block; 52. Discharge block; 53. Feed chamber; 54. Discharge chamber; 55. Extrusion chamber; 56. Exhaust hole; 57. Gas-liquid separation membrane; 61. Splicing block; 62. Connecting block; 63. Collecting chamber; 64. Card block; 65. Extension block; 66. Aggregation chamber; 67. Reflux chamber; 68. Strap; 69. Arc plate; 610. Diverter bump; 71. Fixed frame; 72. Radiator; 73. Strip hole. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described 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 creative work are within the scope of protection of the present invention.

[0040] Example 1: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.12As shown: a hydrothermal hardening PHA straw extrusion device, including an extrusion component 2, the extrusion component 2 includes two symmetrically inclined extrusion tubes 23, the inclination angle of the extrusion tubes 23 is set between 40 degrees and 50 degrees, the outer wall of the extrusion tube 23 is movably connected with a heating component 4, the bottom of the extrusion tube 23 is connected to a support frame 1 by bolts, the extrusion ports of the two extrusion tubes 23 are detachably connected with an extrusion component 5 and a condensation component 6 wrapped around the outer wall thereof, the condensation component 6 is used to collect water vapor, the top of the condensation component 6 is fixedly connected with a heat dissipation component 7, a flange 26 is provided at the intersection of the extrusion component 5 and the extrusion tube 23, a spiral rod is provided inside the extrusion component 2, When in use, the granular PHA raw material will be heated into a molten state by the heating component 4. As the screw rod rotates, the melt will eventually be extruded from the other end of the extrusion tube 23. The screw rod is set in the extrusion tube 23, which is an existing and public technology and will not be described in detail here. The entire extrusion tube 23 is set in an inclined state. In the actual process of conveying the melt, the melt itself will be affected by gravity, and the spiral blades on the screw rod have a supporting force on the melt. Under the action of gravity, the friction between the melt in the extrusion tube 23 and the screw rod is greater than the friction in the horizontal setting state. In the process of the screw rod rotating, the melt can be better stirred to release water vapor;

[0041] according to Fig.11 and Fig.12As shown, the extrusion assembly 5 includes a docking block 51 and a discharge block 52, the discharge block 52 and the docking block 51 are fixedly connected, the cross-sections of the docking block 51 and the discharge block 52 are T-shaped with bent ends, a feed chamber 53 is provided inside the docking block 51, the feed chamber 53 is connected to the extrusion tube 23, a discharge chamber 54 is provided inside the discharge block 52, the discharge chamber 54 is connected to the feed chamber 53, an extrusion chamber 55 is provided at the intersection of the discharge chamber 54 and the feed chamber 53, the extrusion chamber 55 is in a horizontal state, the discharge chamber 54 and the extrusion chamber 55 are perpendicular to each other, a vertically upward exhaust hole 56 is provided on the top of the docking block 51, the exhaust holes 56 are arranged in a matrix, and a gas-liquid separation membrane 57 for blocking the PHA raw material melt is provided inside the exhaust hole 56, the docking block 51 and the discharge block 52 are T-shaped as a whole with bent ends, wherein the docking block 51 is used for docking the extrusion tube 23, the extrusion tube 2 3 is connected with the docking block 51 through the flange 26. When the PHA raw material is extruded, the melt first enters the feed chamber 53, and then flows into the discharge chamber 54 through the extrusion chamber 55. In this process, the movement route of the melt is first in the horizontal direction, and then it is quickly changed to the vertical direction. In this process of changing direction, the melt located at the top has a longer flow range route, and in the process of changing direction, part of it is in a horizontal state and part of it is in a vertical state. There is an angle bend as a whole. The melt route at the top is longer, and the melt in the vertical state will also pull the melt in the horizontal state. Therefore, the melt at the top of the bending part will be subjected to a greater pulling force, thereby achieving the purpose of tearing the melt apart, thereby releasing the water vapor inside it. The melt that subsequently flows into the discharge chamber 54 will squeeze each other, and the remaining water vapor will be pressed out of the melt, thereby achieving the purpose of discharging water vapor. Fig.11 and Fig.12 In the figure, the solid line is the melt flow direction, and the dotted line is the water vapor flow direction;

[0042] A reduction motor 21 is fixedly installed on the upper surface of the support frame 1, and the output end of the reduction motor 21 is movably connected to a belt transmission assembly 22, and the other end of the belt transmission assembly 22 is movably connected to the spiral rod in the extrusion tube 23. A discharge port 27 is opened at one end of the extrusion tube 23, and a bending tube 25 is fixedly connected to the top of the discharge port 27, and the other end of the bending tube 25 is fixedly connected to a discharge barrel 24. A limit ring 28 is fixedly installed on the outer wall of the extrusion tube 23. The heating assembly 4 includes an electric heating plate 41, which is sleeved on the outer wall of the extrusion tube 23, and the electric heating plate 41 is located between the two limit rings 28. The bottom of the electric heating plate 41 is rotatably connected to a positioning block 42. A wire management plate 43 is fixedly installed on the top of the support frame 1, and the wiring terminal of the electric heating plate 41 is fixedly connected to the electric control cabinet 3. The wires of the electric heating plate 41 are arranged in the wire management plate 43 to avoid the problem of loose lines.

[0043] according to Figure 1 and Figure 2 As shown, the bottom of the discharge block 52 is fixedly connected to an arc-shaped pipe 9, the other end of the arc-shaped pipe 9 is fixedly connected to a cooling trough 8, an electric heating rod 10 is placed inside the cooling trough 8, blocking blocks 11 are fixedly installed at both ends of the inner wall of the cooling trough 8, the arc-shaped pipe 9 is a large arc structure, which does not affect the transportation of the straws, and the extruded straws pass through the arc-shaped pipe 9 into the cooling trough 8, and cooling water is contained in the cooling trough 8. The cooling water is heated by the electric heating rod 10 to a temperature between 60°C and 70°C, so that the straws can be pre-crystallized.

[0044] In this embodiment, when in use, the granular PHA raw material enters the extrusion tube 23 from the discharge barrel 24 through the bending tube 25, and then the reduction motor 21 drives the screw rod in the extrusion tube 23 through the belt transmission component 22. At the same time, the heating component 4 is controlled by the electric control cabinet 3, and the electric heating plate 41 heats the granular raw material in the extrusion tube 23 into a molten state, and the rotation of the screw rod will transport the melt to the other end of the extrusion tube 23. In this process, the friction between the extrusion tube 23 in the inclined state and the melt is greater than that in the horizontal state, which can improve the mixing efficiency;

[0045] After the melt enters the extrusion component 5, it is torn and then squeezed against each other, and the water vapor contained therein is discharged. The discharged water vapor will pass through the exhaust hole 56 into the condensation component 6, so as to avoid the problem of secondary contact between water vapor and the melt. The gas-liquid separation membrane 57 in the exhaust hole 56 is used to prevent the melt from leaking. The gas-liquid separation membrane 57 can prevent the melt from flowing out, but can ensure that the water vapor can flow normally. The gas-liquid separation membrane 57 is one of a polytetrafluoroethylene membrane or a polyimide membrane. Finally, the PHA melt will be discharged from the discharge chamber 54 in the discharge block 52.

[0046] Embodiment 2: According to Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the condensation assembly 6 includes a splicing block 61, and a connecting block 62 is fixedly installed on the outer walls of the two splicing blocks 61. The two splicing blocks 61 are spliced ​​together on the outside of the docking block 51 to form a shell for collecting water vapor. The two connecting blocks 62 are connected by a threaded rod. An extension block 65 is fixedly connected to the bottom of the splicing block 61. The extension block 65 is sleeved on the outer wall of the discharge block 52. A clamping block 64 is fixedly installed at the intersection of the splicing block 61 and the extension block 65. The cross section of the clamping block 64 is arrow-shaped, and the protruding part of the clamping block 64 is stuck at the intersection of the docking block 51 and the discharge block 52. A strap 68 is fixedly installed on the inner wall of the splicing block 61. The strap 68 is overlapped on the upper surface of the docking block 51. The exhaust hole 56 is located between the two straps 68, and a gap with a width equal to the range of the exhaust hole 56 is left between the two straps 68.

[0047] In this embodiment, two connecting blocks 62 are connected together by bolts to form two splicing blocks 61 together, so that a shell capable of collecting water vapor is spliced ​​outside the docking block 51. The strap 68 provided at the junction of the splicing block 61 and the docking block 51 can ensure that water vapor can flow normally without affecting the stability of the splicing block 61. The water vapor flowing out of the exhaust hole 56 will enter the interior of the splicing block 61.

[0048] During the process of assembling the splicing block 61, the extension block 65 will cover the outer wall of the discharge block 52 to wrap the discharge block 52. At the same time, the clamping block 64 will fill in the gap between the extension block 65 and the docking block 51, thereby improving the stability of the condensation component 6. The extension block 65 is specifically tubular and is sleeved on the outside of the discharge block 52 to cool the melt and speed up the subsequent molding.

[0049] Embodiment 3: According to Figure 4 , Figure 6 and Figure 7 As shown, one end of the strap 68 is fixedly connected to an arc plate 69, a gap for water vapor flow is left between the two arc plates 69, the bending direction of the arc plate 69 is toward the top of the splicing block 61, the angle between the arc plate 69 and the strap 68 is between 120 degrees and 130 degrees, and a gap with a width of the strap 68 thickness is left between the highest point of the arc plate 69 and the splicing block 61, and a collecting chamber 63 is opened inside the splicing block 61, and a diversion protrusion 610 is fixedly installed on the inner wall of the collecting chamber 63 The diversion protrusion 610 is located at the midpoint between the two arc-shaped plates 69, the collecting chamber 63 is connected to the exhaust hole 56, a gathering chamber 66 is opened inside the extension block 65, and the bottom of the collecting chamber 63 is connected to the reflux chamber 67. The heat dissipation component 7 includes a fixed frame 71 and a radiator 72. A strip hole 73 is opened at the edge of the fixed frame 71. The edge of the radiator 72 is fixedly connected to the inner wall of the fixed frame 71. The contact sheets in the radiator 72 are fixedly connected to both sides of the top of the splicing block 61.

[0050] In this embodiment, the arc plate 69 is used to guide the flow direction of water vapor. A diversion protrusion 610 for diversion is provided between the two arc plates 69. The diversion protrusion 610 is specifically in the shape of an inverted mountain. The protrusion in the middle area is used for diversion, and the protrusions in the two side areas are used to prevent the condensed water from flowing back and dripping into the exhaust hole 56. The contact sheet in the radiator 72 is installed on the top of the splicing block 61, just above the collection chamber 63, so as to ensure that the area where the condensed water is generated is located on the side of the arc plate 69.

[0051] After the water vapor flowing out of the exhaust hole 56 enters the collecting chamber 63, the operation of the radiator 72 keeps the temperature of the top of the collecting chamber 63 at a relatively low level, so that the water vapor can condense into liquid. The position of the radiator 72 is determined by the fixing frame 71, and the strip holes 73 at the edge are used to ensure that the air can circulate normally.

[0052] After the water vapor is liquefied into condensed water, it will flow into the reflux chamber 67 along the inner wall of the collecting chamber 63 under the action of gravity, and finally be concentrated in the gathering chamber 66 of the extension block 65. The condensed water in the reflux chamber 67 and the gathering chamber 66 can effectively absorb the heat in the discharge block 52, thereby accelerating the molding speed of the PHA melt.

[0053] The use method and working principle of the device are as follows: first, the PHA raw material is poured into the discharge barrel 24, and the PHA raw material passes through the discharge port 27 and falls into the interior of the extrusion tube 23, and then the reduction motor 21 is started, and the reduction motor 21 drives the screw rod in the extrusion tube 23 through the belt transmission assembly 22, and when the screw rod rotates, the PHA raw material is pushed to the extrusion port at the other end of the extrusion tube 23;

[0054] During the extrusion process, the electric control cabinet 3 controls the electric heating plate 41 to heat the PHA raw material in the extrusion tube 23. As the screw rotates, the PHA raw material gradually melts at high temperature to form a uniform molten plastic. The heating temperature is controlled between 160°C and 180°C, and the screw speed is controlled between 30 and 100 rpm. The extrusion tube 23 is set to an inclined state. In the actual process of conveying the melt, the melt itself will be affected by gravity, and the spiral blades on the screw have a supporting force on the melt. Under the action of gravity, the friction between the melt in the extrusion tube 23 and the screw is greater than the friction in the horizontal setting state. In the process of the screw rotating, the melt can be better stirred to release water vapor.

[0055] The molten PHA raw material enters the feed chamber 53 from the extruder port, and then flows out from the discharge chamber 54. In this process, the movement route of the melt is first horizontal, and then quickly changed to a vertical direction. In the process of changing direction, the melt located at the top has a longer flow range and in the process of changing direction, the melt is torn apart to release the water vapor inside. The melt that subsequently flows into the discharge chamber 54 will squeeze each other, and the remaining water vapor will be pressed out of the melt, thereby achieving the purpose of discharging the water vapor.

[0056] The radiator 72 is turned on to continuously dissipate heat from the condensation assembly 6. The water vapor flowing out of the exhaust hole 56 will enter the collection chamber 63 in the splicing block 61. The operation of the radiator 72 will keep the temperature at the top of the collection chamber 63 at a relatively low level, so that the water vapor in the collection chamber 63 can be condensed into liquid. After the water vapor is liquefied into condensed water, it will flow into the reflux chamber 67 along the inner wall of the collection chamber 63 under the action of gravity, and finally be concentrated in the gathering chamber 66 of the extension block 65. The condensed water in the reflux chamber 67 and the gathering chamber 66 can effectively absorb the heat in the discharge block 52, thereby accelerating the molding speed of the PHA melt.

[0057] After extrusion, the PHA straws are passed through the arc-shaped pipe 9 into the cooling tank 8. The electric heating rod 10 in the cooling tank 8 heats the cooling water to between 60° C. and 70° C., thereby improving the hardness of the straws through high-temperature crystallization treatment.

[0058] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrothermally hardened PHA straw extrusion device, characterized in that: The invention comprises an extrusion assembly (2), wherein the extrusion assembly (2) comprises two extrusion tubes (23) symmetrically and obliquely arranged, a heating assembly (4) being movably connected to the outer wall of the extrusion tube (23), the bottom of the extrusion tube (23) being connected to a support frame (1) by bolts, an extrusion assembly (5) and a condensation assembly (6) coated on the outer wall of the two extrusion tubes (23) being detachably connected at the extrusion ports, the condensation assembly (6) being used to collect water vapor, a heat dissipation assembly (7) being fixedly connected to the top of the condensation assembly (6), and a flange (26) being provided at the junction of the extrusion assembly (5) and the extrusion tube (23); The extrusion assembly (5) comprises a docking block (51) and a discharge block (52), the discharge block (52) and the docking block (51) are fixedly connected, the cross-sections of the docking block (51) and the discharge block (52) are T-shaped with two ends bent, a feed chamber (53) is provided inside the docking block (51), the feed chamber (53) is connected to the extrusion tube (23), a discharge chamber (54) is provided inside the discharge block (52), an extrusion chamber (55) is provided at the junction of the discharge chamber (54) and the feed chamber (53), the extrusion chamber (55) is in a horizontal state, the discharge chamber (54) and the extrusion chamber (55) are perpendicular to each other, a vertically upward exhaust hole (56) is provided on the top of the docking block (51), the exhaust holes (56) are arranged in a matrix, and a gas-liquid separation membrane (57) for blocking the PHA raw material melt is provided inside the exhaust hole (56); The bottom of the discharge block (52) is fixedly connected to an arc-shaped pipe (9), the other end of the arc-shaped pipe (9) is fixedly connected to a cooling trough (8), an electric heating rod (10) is placed inside the cooling trough (8), and blocking blocks (11) are fixedly installed at both ends of the inner wall of the cooling trough (8).

2. A hydrothermally hardened PHA straw extrusion device according to claim 1, characterized in that: The condensation assembly (6) comprises a splicing block (61), and a connecting block (62) is fixedly mounted on the outer wall of two splicing blocks (61). The two splicing blocks (61) are spliced ​​together outside the docking block (51) to form a shell for collecting water vapor, and the two connecting blocks (62) are connected by a threaded rod.

3. A hydrothermally hardened PHA straw extrusion device according to claim 2, characterized in that: The bottom of the splicing block (61) is fixedly connected with an extension block (65), and the extension block (65) is sleeved on the outer wall of the discharge block (52). A clamping block (64) is fixedly installed at the intersection of the splicing block (61) and the extension block (65), and the cross section of the clamping block (64) is arrow-shaped. The protruding part of the clamping block (64) is clamped at the intersection of the docking block (51) and the discharge block (52).

4. A hydrothermally hardened PHA straw extrusion device according to claim 3, characterized in that: A strap (68) is fixedly mounted on the inner wall of the splicing block (61), the strap (68) being overlapped on the upper surface of the docking block (51), the exhaust hole (56) being located between the two straps (68), and a gap having a width equal to the range of the exhaust hole (56) being left between the two straps (68).

5. A hydrothermally hardened PHA straw extrusion device according to claim 4, characterized in that: One end of the strap (68) is fixedly connected to an arc-shaped plate (69), a gap for water vapor flow is left between the two arc-shaped plates (69), the bending direction of the arc-shaped plate (69) is toward the top of the splicing block (61), and a gap with a width equal to the thickness of the strap (68) is left between the highest point of the arc-shaped plate (69) and the splicing block (61).

6. A hydrothermally hardened PHA straw extrusion device according to claim 5, characterized in that: A collecting chamber (63) is provided inside the splicing block (61), a flow dividing protrusion (610) is fixedly mounted on the inner wall of the collecting chamber (63), the flow dividing protrusion (610) is located at the midpoint between the two arc-shaped plates (69), the collecting chamber (63) is connected to the exhaust hole (56), a gathering chamber (66) is provided inside the extending block (65), and the bottom of the collecting chamber (63) is connected to a reflux chamber (67).

7. The hydrothermally hardened PHA straw extrusion device according to claim 1, characterized in that: The heat dissipation assembly (7) comprises a fixed frame (71) and a heat sink (72); a strip hole (73) is provided at the edge of the fixed frame (71); the edge of the heat sink (72) is fixedly connected to the inner wall of the fixed frame (71); and the contact sheets in the heat sink (72) are fixedly connected to both sides of the top of the splicing block (61).

8. The hydrothermally hardened PHA straw extrusion device according to claim 3, characterized in that: A reduction motor (21) is fixedly mounted on the upper surface of the support frame (1); the output end of the reduction motor (21) is movably connected to a belt transmission assembly (22); the other end of the belt transmission assembly (22) is movably connected to a spiral rod in an extrusion tube (23); a discharge port (27) is provided at one end of the extrusion tube (23); a bending tube (25) is fixedly connected to the top of the discharge port (27); the other end of the bending tube (25) is fixedly connected to a discharge barrel (24); and a limiting ring (28) is fixedly mounted on the outer wall of the extrusion tube (23).

9. A hydrothermally hardened PHA straw extrusion device according to claim 8, characterized in that: The heating assembly (4) comprises an electric heating plate (41), the electric heating plate (41) is sleeved on the outer wall of the extrusion tube (23), and the electric heating plate (41) is located between two limiting rings (28), the bottom of the electric heating plate (41) is rotatably connected to a positioning block (42), the top of the support frame (1) is fixedly installed with a wiring board (43), and the wiring terminal of the electric heating plate (41) is fixedly connected to an electric control cabinet (3).

10. A method for using a hydrothermally hardened PHA straw extrusion device, using the hydrothermally hardened PHA straw extrusion device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, pouring PHA raw material into the discharge barrel (24), the PHA raw material passes through the discharge port (27) and falls into the interior of the extrusion tube (23), then starting the reduction motor (21), the reduction motor (21) drives the screw rod in the extrusion tube (23) through the belt transmission component (22), and when the screw rod rotates, it pushes the PHA raw material to the extrusion port at the other end of the extrusion tube (23); S2. During the extrusion process, the electric control cabinet (3) controls the electric heating plate (41) to heat the PHA raw material in the extrusion tube (23). As the screw rotates, the PHA raw material gradually melts at high temperature to form a uniform molten plastic. The heating temperature is controlled between 160° C. and 180° C., and the screw speed is controlled between 30 and 100 rpm. S3, the molten PHA raw material enters the feed chamber (53) from the extruder port, and then flows out from the discharge chamber (54). During this process, the radiator (72) is turned on to continuously dissipate heat from the condensation component (6); S4. The extruded PHA straws enter the cooling trough (8) along the arc-shaped pipe (9). The electric heating rod (10) in the cooling trough (8) heats the cooling water to between 60° C. and 70° C., thereby improving the hardness of the straws through high-temperature crystallization treatment.

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