Underwater continuous pelletizing device for PHA biodegradable plastics

Abstract

The invention belongs to the technical field of plastic pelletizing, and discloses a PHA biodegradable plastic underwater continuous pelletizing device which comprises a rack, the inner side face of the rack is fixedly sleeved with a material extruding tank, the left end of the material extruding tank fixedly communicates with a water cooling tank, and the right side of the top end of the material extruding tank fixedly communicates with a feeding port; and the top end of the water cooling tank fixedly communicates with a water injection opening, the bottom end of the water cooling tank fixedly communicates with a discharging opening, and a pelletizing assembly is installed on the left side of the material extruding tank through bolts. According to the device, the movable maintenance assembly is matched with the switching assembly, so that the device can be switched between a normal pelletizing state and a self-cleaning state, meanwhile, the device does not need to be shut down in the whole switching process, the device can automatically clean the surface of the groove in an online state, and the working efficiency is improved. The problems that a traditional device needs to be shut down for cleaning and the pelletizing state is affected are solved, and the cleaning efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic pelletizing, and in particular relates to an underwater continuous pelletizing device for PHA biodegradable plastics. Background Art

[0002] PHA is a natural high molecular weight polyester material synthesized by organisms such as microorganisms, plants and animals. It is a linear biopolymer with hydroxy fatty acid ester as the main chain and hydroxyl as the terminal group. It exists in microbial cells such as bacterial cells. It is the product of bacteria when the growth conditions are unbalanced. It is also a carbon source and energy storage material in microorganisms. In the processing of biodegradable plastics, a continuous pelletizing device is required to realize the pelletizing operation. In order to accelerate cooling, the pelletizing operation is often carried out in water, that is, an underwater continuous pelletizing device is used to assist the pelletizing operation.

[0003] Conventional underwater continuous pelletizing components generally use the cooperation between high-speed rotating pelletizing blades and pelletizing templates to cut plastic pellets, that is, the molten plastic is extruded from the extrusion holes on the pelletizing template by an extruder, and pelletizing is achieved by rotating the blades. The pelletized plastic falls into a water cooling box for cooling. In the above pelletizing process, due to a certain gap between the blades and the template, waste will adhere to the surface of the template after long-term use, affecting the entire pelletizing process. The machine needs to be stopped for cleaning, which is inconvenient to use.

[0004] At the same time, since the pelletizing blade rotates at high speed during the entire pelletizing process and the entire pelletizing is carried out underwater, long-term use will still cause wear on the blade edge. In the prior art, the equipment needs to be shut down regularly and the blade needs to be polished. The entire maintenance process is relatively complicated, affecting the actual processing efficiency. Summary of the invention

[0005] The object of the present invention is to provide an underwater continuous pelletizing device for PHA biodegradable plastics to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a PHA biodegradable plastic underwater continuous pelletizing device, comprising a frame, an inner side surface of the frame is fixedly sleeved with an extrusion tank, the left end of the extrusion tank is fixedly connected to a water cooling tank, the right side of the top of the extrusion tank is fixedly connected to a feed port, the top of the water cooling tank is fixedly connected to a water injection port, the bottom end of the water cooling tank is fixedly connected to a discharge port, a pelletizing assembly is installed on the left side of the extrusion tank by bolts, a pelletizing blade located on the left side of the pelletizing assembly is movably installed inside the water cooling tank, the pelletizing blade rotates relative to the water cooling tank, a guide groove is opened on the right side of the pelletizing blade, a switching assembly is installed inside the guide groove, a maintenance assembly is provided on the right side of the pelletizing blade, the maintenance assembly is movably engaged with the guide groove and moves up and down relative to the guide groove.

[0007] Before use, the device needs to be fixed by the frame, and the external cooling water pipe needs to be connected to the water injection port to ensure the injection of cooling water. At the same time, the discharge port needs to correspond to the particle drying device to ensure that the plastic particles can be dried quickly after cooling. At the same time, the plastic raw materials need to be put into the device through the feed port to complete the preparation before processing.

[0008] As a further technical solution of the present invention, a main shaft is movably installed in the middle of the extrusion tank, and the outer side surface of the main shaft is fixedly sleeved with a spiral blade located inside the extrusion tank. A first machine base is fixedly installed on the right side of the extrusion tank, and an extrusion motor is fixedly installed inside the first machine base, and the output end of the extrusion motor is connected to one side of the main shaft.

[0009] An electric heating element is built into the extrusion tank to heat the plastic raw materials to a molten state.

[0010] When the plastic raw material enters the extrusion tank through the feed port, it can be heated to a molten state, and the extrusion motor can be turned on to drive the main shaft to rotate. At this time, the spiral blades on the outer side of the main shaft rotate accordingly and push the molten plastic to move to the left until it moves to the pelletizing component.

[0011] As a further technical solution of the present invention, an oil storage tank is fixedly installed in the middle of the left side of the pelletizing blade, and the oil storage tank is connected to the maintenance component. An electric push rod is movably installed in the middle of the water cooling tank, and the output end of the electric push rod is connected to one side of the oil storage tank.

[0012] As a further technical solution of the present invention, the pelletizing assembly includes a pelletizing template, which is connected to the left side of the extrusion tank by bolts, a groove is opened on the left side of the pelletizing template, and an extrusion hole is opened in a circular shape on the left side of the groove.

[0013] As a further technical solution of the present invention, a second machine base is fixedly installed on the left side of the water cooling tank, a pelletizing motor is fixedly installed on the inner side of the second machine base, and an output end of the pelletizing motor is connected to one side of the electric push rod.

[0014] As the molten plastic is extruded and as the pressure increases, the molten plastic is extruded through the extrusion hole opened on the pelletizing template and enters the interior of the water-cooling tank. At this time, the pelletizing motor can be turned on to drive the electric push rod to rotate, and drive the oil storage tank and the pelletizing blade to rotate. At this time, the pelletizing blade can rotate relative to the pelletizing template, and with the high-speed rotation of the pelletizing blade and the extruded plastic raw material, the plastic can be pelletized. The pelletized plastic particles then fall into the interior of the water-cooling tank and enter the water to complete cooling. The cooled plastic particles are then discharged through the discharge port and dried through external drying. At the same time, the pelletizing length can be adjusted by adjusting the rotation speed of the pelletizing blade.

[0015] As a further technical solution of the present invention, the switching assembly includes an adjusting tube, the bottom end of the adjusting tube is connected to the bottom end of the inner cavity of the guide groove, and the adjusting tube is fixedly connected to an oil pipe at the right position near the top, and the right side of the oil pipe passes through the right side of the pelletizing blade and is connected to the oil storage tank.

[0016] As a further technical solution of the present invention, the internal movably sleeved adjustment plate of the adjusting tube has an adjusting plate fixedly connected to the top of the adjusting plate, the top of the adjusting rod passes through the top of the adjusting tube and is connected to the maintenance component, the outer side surface of the adjusting rod has a reset spring movably sleeved, the upper and lower ends of the reset spring are connected to one end of the maintenance component and the top of the adjusting tube.

[0017] When the device is not in working state, that is, the switching component is in the initial state, the reset spring is not subjected to pressure, the adjustment plate is at the highest point, and the adjustment rod is also at the highest point. When the device is in the pelletizing state, the valve at one end of the oil storage tank can be opened, and the direction of the electromagnetic reversing valve of the oil pipeline can be changed to conduct in the direction of the adjustment pipe and cut off in the direction of the oil storage tank, the hydraulic oil is discharged and introduced into the interior of the adjustment pipe through the oil pipeline. At this time, the adjustment plate is pressurized and drives the adjustment rod to move downward, and the reset spring is compressed accordingly, and a force is applied to the maintenance component, so that the maintenance component moves downward as a whole to avoid affecting the pelletizing state.

[0018] As a further technical solution of the present invention, the maintenance component includes a linkage plate, a guide block is fixedly installed at the top position on the left side of the linkage plate, the guide block is movably connected to the guide groove, and a cleaning brush matched with the groove is fixedly installed on the top of the linkage plate. When the reset spring is in the initial state, the cleaning brush is located directly in front of the groove.

[0019] When waste adheres to the inside of the groove, the direction of the electromagnetic reversing valve of the oil pipeline can be changed to turn it toward the oil tank and toward the regulating pipe. At this time, the reset spring can be automatically reset and drive the regulating plate and the regulating rod to rise. At this time, the guide block can be pushed up and the linkage plate can be driven up until the guide block rises to the highest point. At this time, the cleaning brush is just located in front of the groove. At this time, the electric push rod can be started synchronously to control its extension, so as to push the pelletizing blade toward the pelletizing template until the cleaning brush contacts the surface of the groove and cooperates with the rotation of the pelletizing blade to realize self-cleaning of the groove surface and complete the self-cleaning process.

[0020] By utilizing the movable maintenance component in conjunction with the switching component, the device can switch between the normal pelletizing state and the self-cleaning state. At the same time, the device does not need to be shut down during the entire switching process, so that the device can automatically clean the surface of the groove online, avoiding the problem that traditional devices need to be shut down for cleaning and affect the pelletizing state, thereby improving cleaning efficiency.

[0021] As a further technical solution of the present invention, a bottom fixing block is fixedly installed at the bottom end of the linkage plate, and a sharpening groove is opened on the inner side of the bottom fixing block. When the reset spring is in the initial state, the inner side of the sharpening groove contacts the outer side of the pelletizing blade.

[0022] When the surface of the groove is automatically cleaned, the bottom fixed block can be driven to rise synchronously due to the rise of the linkage plate. When the guide block rises to the highest point, the bottom fixed block also rises to the highest point, and the inner side of the grinding groove contacts the outer side of the pelletizer blade, and cooperates with the rotation of the pelletizer blade to automatically grind the blade edge of the pelletizer blade to complete the online grinding process.

[0023] By utilizing the action of automatic cleaning of the groove surface, self-cleaning and automatic grinding can be achieved at the same time. The whole process is completed automatically, avoiding the need for traditional devices to stop for maintenance. At the same time, the grinding process is carried out underwater, which can further improve the grinding efficiency, significantly reduce the difficulty of maintenance, and improve the overall processing efficiency.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. The present invention utilizes a movable maintenance component in conjunction with a switching component to enable the device to switch between a normal pelletizing state and a self-cleaning state. At the same time, the device does not need to be shut down during the entire switching process, so that the device can automatically clean the surface of the groove in an online state, thereby avoiding the problem that the traditional device needs to be shut down for cleaning and affects the pelletizing state, thereby improving the cleaning efficiency.

[0026] 2. The present invention realizes self-cleaning and automatic polishing by utilizing the action of automatic cleaning process on the groove surface. The whole process is completed automatically, avoiding the need for traditional devices to be shut down for maintenance. At the same time, the polishing process is carried out underwater, which can further improve the polishing efficiency, significantly reduce the difficulty of maintenance, and improve the overall processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a schematic diagram of the bottom structure of the present invention;

[0029] Figure 3 It is a rear cross-sectional schematic diagram of the internal structure of the squeezing tank and the water cooling tank of the present invention;

[0030] Figure 4 It is a front cross-sectional schematic diagram of the internal structure of the squeezing tank and the water cooling tank of the present invention;

[0031] Figure 5 A separate schematic diagram of the pelletizing assembly structure of the present invention;

[0032] Figure 6 It is a cross-sectional schematic diagram of the pelletizing blade, the oil storage tank and the maintenance assembly structure of the present invention;

[0033] Figure 7 for Figure 6 A magnified schematic diagram of the structure at center A;

[0034] Figure 8 A separate schematic diagram of the component structure is maintained for the present invention.

[0035] In the figure: 1. frame; 2. extrusion tank; 3. feed port; 4. first machine base; 5. extrusion motor; 6. water cooling tank; 7. second machine base; 8. pelletizing motor; 9. water injection port; 10. discharge port; 11. main shaft; 12. spiral blade; 13. pelletizing assembly; 131. pelletizing template; 132. groove; 133. extrusion hole; 14. pelletizing blade; 15. electric push rod; 16. guide groove; 17. switching assembly; 171. adjusting tube; 172. adjusting plate; 173. adjusting rod; 174. oil pipeline; 175. reset spring; 18. maintenance assembly; 181. linkage plate; 182. guide block; 183. bottom fixing block; 184. cleaning brush; 185. sharpening groove; 19. oil storage tank. DETAILED DESCRIPTION

[0036] 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 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 creative work are within the scope of protection of the present invention.

[0037] like Figures 1 to 8 As shown, in the embodiment of the present invention, a PHA biodegradable plastic underwater continuous pelletizing device includes a frame 1, an inner side surface of the frame 1 is fixedly sleeved with an extrusion tank 2, the left end of the extrusion tank 2 is fixedly connected with a water cooling tank 6, the right side of the top of the extrusion tank 2 is fixedly connected with a feed port 3, the top of the water cooling tank 6 is fixedly connected with a water injection port 9, the bottom of the water cooling tank 6 is fixedly connected with a discharge port 10, a pelletizing assembly 13 is installed on the left side of the extrusion tank 2 by bolts, a pelletizing blade 14 located on the left side of the pelletizing assembly 13 is movably installed inside the water cooling tank 6, the pelletizing blade 14 rotates relative to the water cooling tank 6, a guide groove 16 is opened on the right side of the pelletizing blade 14, a switching assembly 17 is installed inside the guide groove 16, a maintenance assembly 18 is provided on the right side of the pelletizing blade 14, and the maintenance assembly 18 is movably engaged with the guide groove 16 and moves up and down relative to the guide groove 16.

[0038] Before use, the device needs to be fixed by the frame 1, and the external cooling water pipe is connected to the water injection port 9 to ensure the injection of cooling water. At the same time, the discharge port 10 is aligned with the particle drying device to ensure that the plastic particles can be quickly dried after cooling. At the same time, the plastic raw materials are put into the interior of the device through the feed port 3 to complete the preparation before processing.

[0039] like Figure 1 and Figure 2 as well as Figure 3 As shown, a main shaft 11 is movably installed in the middle of the extrusion tank 2, and a spiral blade 12 located inside the extrusion tank 2 is fixedly sleeved on the outer side surface of the main shaft 11. A first machine base 4 is fixedly installed on the right side of the extrusion tank 2, and an extrusion motor 5 is fixedly installed inside the first machine base 4. The output end of the extrusion motor 5 is connected to one side of the main shaft 11.

[0040] An electric heating element is built into the extrusion tank 2 to heat the plastic raw material to a molten state.

[0041] When the plastic raw material enters the extrusion tank 2 through the feed port 3, it can be heated to a molten state, and the extrusion motor 5 can be turned on to drive the main shaft 11 to rotate. At this time, the spiral blade 12 located on the outer side of the main shaft 11 rotates accordingly and pushes the molten plastic to move to the left until it moves to the pelletizing component 13.

[0042] like Figure 3 and Figure 4 as well as Figure 5 and Figure 6 As shown, an oil storage tank 19 is fixedly installed in the middle of the left side of the pelletizing blade 14, and the oil storage tank 19 is connected to the maintenance component 18. An electric push rod 15 is movably installed in the middle of the water-cooling tank 6, and the output end of the electric push rod 15 is connected to one side of the oil storage tank 19. The pelletizing component 13 includes a pelletizing template 131, and the pelletizing template 131 is connected to the left side of the extrusion tank 2 by bolts. A groove 132 is opened on the left side of the pelletizing template 131, and an extrusion hole 133 is opened in a circular shape on the left side of the groove 132. A second machine base 7 is fixedly installed on the left side of the water-cooling tank 6, and a pelletizing motor 8 is fixedly installed on the inner side of the second machine base 7, and the output end of the pelletizing motor 8 is connected to one side of the electric push rod 15.

[0043] As the molten plastic is extruded and as the pressure increases, the molten plastic is extruded through the extrusion hole 133 opened on the pelletizing template 131 and enters the interior of the water-cooling tank 6. At this time, the pelletizing motor 8 can be turned on to drive the electric push rod 15 to rotate, and drive the oil storage tank 19 and the pelletizing blade 14 to rotate. At this time, the pelletizing blade 14 can rotate relative to the pelletizing template 131, and with the high-speed rotation of the pelletizing blade 14 and the extruded plastic raw material, the plastic can be pelletized. The pelletized plastic particles then fall into the interior of the water-cooling tank 6 and enter the water to complete cooling. The cooled plastic particles are then discharged through the discharge port 10 and dried through external drying. At the same time, the pelletizing length can be adjusted by adjusting the rotation speed of the pelletizing blade 14.

[0044] like Figure 4 and Figure 6 as well as Figure 7 As shown, the switching assembly 17 includes an adjusting tube 171, the bottom end of the adjusting tube 171 is connected to the bottom end of the inner cavity of the guide groove 16, and an oil delivery pipe 174 is fixedly connected to the right position near the top of the adjusting tube 171, and the right side of the oil delivery pipe 174 passes through the right side of the pelletizing blade 14 and is connected to the oil storage tank 19. The inside of the adjusting tube 171 is movably sleeved with an adjusting plate 172, and the top of the adjusting plate 172 is fixedly connected with an adjusting rod 173, and the top of the adjusting rod 173 passes through the top of the adjusting tube 171 and is connected to the maintenance assembly 18. The outer side of the adjusting rod 173 is movably sleeved with a return spring 175, and the upper and lower ends of the return spring 175 are connected to one end of the maintenance assembly 18 and the top of the adjusting tube 171.

[0045] An electromagnetic reversing valve is installed inside the oil delivery pipe 174.

[0046] When the device is not in working state, that is, the switching component 17 is in the initial state, the reset spring 175 is not subjected to pressure, the adjusting plate 172 is at the highest point, and the adjusting rod 173 is also at the highest point. When the device is in the pelletizing state, the valve at one end of the oil storage tank 19 can be opened, and the direction of the electromagnetic reversing valve of the oil delivery pipe 174 is changed to be connected in the direction of the adjusting pipe 171 and cut off in the direction of the oil storage tank 19, and the hydraulic oil is discharged and introduced into the inside of the adjusting pipe 171 through the oil delivery pipe 174. At this time, the adjusting plate 172 is pressurized and drives the adjusting rod 173 to move downward, and the reset spring 175 is compressed accordingly, and exerts a force on the maintenance component 18, so that the maintenance component 18 moves downward as a whole to avoid affecting the pelletizing state.

[0047] like Figure 6 and Figure 7 as well as Figure 8 As shown, the maintenance component 18 includes a linkage plate 181, and a guide block 182 is fixedly installed at the top position on the left side of the linkage plate 181. The guide block 182 is movably connected with the guide groove 16. A cleaning brush 184 adapted to the groove 132 is fixedly installed at the top of the linkage plate 181. When the reset spring 175 is in the initial state, the cleaning brush 184 is located directly in front of the groove 132.

[0048] Embodiment: When waste material adheres to the inside of the groove 132, the direction of the electromagnetic reversing valve of the oil delivery pipe 174 can be changed to turn it toward the direction of the oil storage tank 19 and toward the direction of the regulating pipe 171. At this time, the reset spring 175 can be automatically reset and drive the regulating plate 172 and the regulating rod 173 to rise. At this time, the guide block 182 can be pushed up and the linkage plate 181 can be driven up until the guide block 182 rises to the highest point. At this time, the cleaning brush 184 is just located in front of the groove 132. At this time, the electric push rod 15 can be started synchronously to control its extension, so as to push the pelletizing blade 14 toward the pelletizing template 131 until the cleaning brush 184 contacts the surface of the groove 132 and cooperates with the rotation of the pelletizing blade 14 to achieve self-cleaning of the surface of the groove 132 and complete the self-cleaning process.

[0049] By utilizing the movable maintenance component 18 in cooperation with the switching component 17, the device can be switched between the normal pelletizing state and the self-cleaning state. At the same time, the device does not need to be shut down during the entire switching process, so that the device can automatically clean the surface of the groove 132 online, avoiding the problem that the traditional device needs to be shut down for cleaning and affects the pelletizing state, thereby improving the cleaning efficiency.

[0050] like Figure 6 and Figure 8As shown, a bottom fixing block 183 is fixedly installed at the bottom end of the linkage plate 181, and a sharpening groove 185 is provided on the inner side of the bottom fixing block 183. When the return spring 175 is in the initial state, the inner side of the sharpening groove 185 contacts the outer side of the pelletizing blade 14.

[0051] Embodiment: When the surface of the groove 132 is automatically cleaned, the bottom fixing block 183 can be synchronously driven to rise due to the rise of the linkage plate 181. When the guide block 182 rises to the highest point, the bottom fixing block 183 rises to the highest point accordingly, and the inner side surface of the grinding groove 185 contacts the outer side surface of the pelletizer blade 14, and cooperates with the rotation of the pelletizer blade 14, so that the blade part of the pelletizer blade 14 can be automatically grinded to complete the online grinding process.

[0052] By utilizing the action of automatically cleaning the surface of the groove 132, self-cleaning and automatic polishing can be achieved at the same time, and the whole process is completed automatically, avoiding the need for traditional devices to be shut down for maintenance. At the same time, the polishing process is carried out underwater, which can further improve the polishing efficiency, significantly reduce the difficulty of maintenance, and improve the overall processing efficiency.

[0053] Working principle and usage process:

[0054] Before use, the device needs to be fixed by the frame 1, and the external cooling water pipe needs to be connected to the water injection port 9 to ensure the injection of cooling water. At the same time, the discharge port 10 needs to correspond to the particle drying device to ensure that the plastic particles can be quickly dried after cooling. At the same time, the plastic raw materials need to be put into the device through the feed port 3 to complete the preparation before processing;

[0055] When the plastic raw material enters the extrusion tank 2 through the feed port 3, it can be heated to a molten state, and the extrusion motor 5 can be turned on to drive the main shaft 11 to rotate. At this time, the spiral blade 12 located on the outer side of the main shaft 11 rotates accordingly, and pushes the molten plastic to move to the left until it moves to the pelletizing assembly 13;

[0056] As the molten plastic is extruded and as the pressure increases, the molten plastic is extruded through the extrusion hole 133 opened on the pelletizing template 131 and enters the interior of the water-cooling tank 6. At this time, the pelletizing motor 8 can be turned on to drive the electric push rod 15 to rotate, and drive the oil storage tank 19 and the pelletizing blade 14 to rotate. At this time, the pelletizing blade 14 can rotate relative to the pelletizing template 131, and with the high-speed rotation of the pelletizing blade 14, the plastic can be pelletized in coordination with the extruded plastic raw material. The pelletized plastic particles then fall into the interior of the water-cooling tank 6 and enter the water to complete cooling. The cooled plastic particles are then discharged through the discharge port 10 and dried by external drying. At the same time, the pelletizing length can be adjusted by adjusting the rotation speed of the pelletizing blade 14.

[0057] When the device is not in working state, that is, the switching assembly 17 is in the initial state, at this time, the return spring 175 is not subjected to pressure, the adjustment plate 172 is at the highest point, and the adjustment rod 173 is also at the highest point. When the device is in the pelletizing state, the valve at one end of the oil storage tank 19 can be opened, and the direction of the electromagnetic reversing valve of the oil delivery pipe 174 is changed to be connected in the direction of the adjustment pipe 171 and cut off in the direction of the oil storage tank 19, and the hydraulic oil is discharged and introduced into the inside of the adjustment pipe 171 through the oil delivery pipe 174. At this time, the adjustment plate 172 is pressurized and drives the adjustment rod 173 to move downward, and the return spring 175 is compressed accordingly, and exerts a force on the maintenance assembly 18, so that the maintenance assembly 18 moves downward as a whole to avoid affecting the pelletizing state;

[0058] When waste adheres to the inside of the groove 132, the direction of the electromagnetic reversing valve of the oil delivery pipe 174 can be changed to turn it to the direction of the oil storage tank 19 and the direction of the regulating pipe 171. At this time, the reset spring 175 can be automatically reset and drive the regulating plate 172 and the regulating rod 173 to rise. At this time, the guide block 182 can be pushed to rise, and the linkage plate 181 can be driven to rise until the guide block 182 rises to the highest point. At this time, the cleaning brush 184 is just located at the front of the groove 132. At this time, the electric push rod 15 can be started synchronously to control its extension, so that the pelletizing blade 14 can be pushed to approach the pelletizing template 131 until the cleaning brush 184 contacts the surface of the groove 132, and cooperates with the rotation of the pelletizing blade 14 to achieve self-cleaning of the surface of the groove 132 and complete the self-cleaning process.

[0059] When the surface of the groove 132 is automatically cleaned, the bottom fixing block 183 can be synchronously driven to rise due to the rise of the linkage plate 181. When the guide block 182 rises to the highest point, the bottom fixing block 183 rises to the highest point accordingly, and the inner side surface of the grinding groove 185 contacts the outer side surface of the pelletizer blade 14, and cooperates with the rotation of the pelletizer blade 14 to automatically grind the blade portion of the pelletizer blade 14, completing the online grinding process.

[0060] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PHA biodegradable plastic underwater continuous pelletizing device, comprising a frame (1), characterized in that: The inner side surface of the frame (1) is fixedly sleeved with an extrusion tank (2), the left end of the extrusion tank (2) is fixedly connected to a water cooling tank (6), the right side of the top of the extrusion tank (2) is fixedly connected to a feed port (3), the top of the water cooling tank (6) is fixedly connected to a water injection port (9), the bottom of the water cooling tank (6) is fixedly connected to a discharge port (10), the left side of the extrusion tank (2) is bolted with a pelletizing assembly (13), and the inner part of the water cooling tank (6) is movable. A pelletizer blade (14) is movably mounted on the left side of the pelletizer assembly (13). The pelletizer blade (14) rotates relative to the water cooling tank (6). A guide groove (16) is provided on the right side of the pelletizer blade (14). A switching assembly (17) is installed inside the guide groove (16). A maintenance assembly (18) is provided on the right side of the pelletizer blade (14). The maintenance assembly (18) is movably engaged with the guide groove (16) and moves up and down relative to the guide groove (16).

2. The underwater continuous pelletizing device for PHA biodegradable plastic according to claim 1, characterized in that: A main shaft (11) is movably mounted in the middle of the extrusion tank (2); a spiral blade (12) located inside the extrusion tank (2) is fixedly sleeved on the outer side of the main shaft (11); a first machine base (4) is fixedly mounted on the right side of the extrusion tank (2); an extrusion motor (5) is fixedly mounted inside the first machine base (4); and an output end of the extrusion motor (5) is connected to one side of the main shaft (11).

3. The underwater continuous pelletizing device for PHA biodegradable plastics according to claim 2, characterized in that: An oil storage tank (19) is fixedly installed in the middle of the left side of the pelletizing blade (14), and the oil storage tank (19) is connected to the maintenance component (18). An electric push rod (15) is movably installed in the middle of the water cooling tank (6), and the output end of the electric push rod (15) is connected to one side of the oil storage tank (19).

4. The underwater continuous pelletizing device for PHA biodegradable plastics according to claim 3, characterized in that: The pelletizing assembly (13) comprises a pelletizing template (131), the pelletizing template (131) being connected to the left side of the extrusion tank (2) via bolts, a groove (132) being provided on the left side of the pelletizing template (131), and an extrusion hole (133) being provided in a circular shape on the left side of the groove (132).

5. The underwater continuous pelletizing device for PHA biodegradable plastics according to claim 4, characterized in that: A second machine base (7) is fixedly mounted on the left side of the water cooling tank (6), a pelletizing motor (8) is fixedly mounted on the inner side of the second machine base (7), and an output end of the pelletizing motor (8) is connected to one side of the electric push rod (15).

6. The underwater continuous pelletizing device for PHA biodegradable plastics according to claim 5, characterized in that: The switching assembly (17) comprises an adjusting tube (171), the bottom end of the adjusting tube (171) being connected to the bottom end of the inner cavity of the guide groove (16), and an oil delivery tube (174) being fixedly connected to the right side of the adjusting tube (171) near the top, the right side of the oil delivery tube (174) passing through the right side of the pelletizing blade (14) and being connected to the oil storage tank (19).

7. The underwater continuous pelletizing device for PHA biodegradable plastics according to claim 6, characterized in that: The adjusting tube (171) is internally movably sleeved with an adjusting plate (172), the top end of the adjusting plate (172) is fixedly connected with an adjusting rod (173), the top end of the adjusting rod (173) passes through the top end of the adjusting tube (171) and is connected to the maintenance component (18), the outer side surface of the adjusting rod (173) is movably sleeved with a return spring (175), the upper and lower ends of the return spring (175) are connected to one end of the maintenance component (18) and the top end of the adjusting tube (171).

8. The underwater continuous pelletizing device for PHA biodegradable plastics according to claim 7, characterized in that: The maintenance component (18) comprises a linkage plate (181), a guide block (182) is fixedly mounted on the top position of the left side of the linkage plate (181), the guide block (182) is movably engaged with the guide groove (16), a cleaning brush (184) adapted to the groove (132) is fixedly mounted on the top of the linkage plate (181), and when the reset spring (175) is in an initial state, the cleaning brush (184) is located directly in front of the groove (132).

9. The underwater continuous pelletizing device for PHA biodegradable plastics according to claim 8, characterized in that: A bottom fixing block (183) is fixedly mounted at the bottom end of the linkage plate (181), and a sharpening groove (185) is provided on the inner side surface of the bottom fixing block (183). When the return spring (175) is in an initial state, the inner side surface of the sharpening groove (185) contacts the outer side surface of the pelletizing blade (14).

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