A PVC plastic particle regeneration rapid pelletizing device and method

Abstract

The present invention belongs to the technical field of plastic granulation, and specifically relates to a PVC plastic particle regeneration and rapid granulation device and method thereof, wherein a PVC plastic particle regeneration and rapid granulation device comprises a cutting assembly, which comprises a servo motor providing granulation power and a shaft head base connected to the power output end of the servo motor, and a cutting mechanism is installed on the shaft head base; an air-cooled cover, which has symmetrical guide plates and isolation plates integrally formed inside; a granulator head, which is installed at the extrusion port of the extruder, and an extrusion hole is opened on the granulator head, and a water-cooled circulation mechanism is arranged around the extrusion hole inside; a cleaning needle, which is arranged circumferentially around the periphery of the shaft head base. The present invention can improve the cooling efficiency by combining water cooling and air cooling, and at the same time change the internal structure of the air-cooled cover to make the wind source more concentrated, accelerate the cooling of the extruded plastic strip, and enable the cut plastic particles to be fully cooled without mutual adhesion.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic granulation, and in particular relates to a PVC plastic particle regeneration and rapid granulation device and a method thereof. Background Art

[0002] PVC plastic particles, that is, polyvinyl chloride (PVC) plastic particles, are generally recycled by using an extruder to push and compact them, while heating them to gradually transform them into a molten state. Finally, the molten plastic is extruded from the die under pressure into strips, and then cooled and crushed into particles by a pelletizer.

[0003] Among them, the commonly used pelletizing device for PVC plastic particles is the air-cooled hot-cutting pelletizer, which has the main characteristics of simple structure, easy maintenance and high pelletizing efficiency.

[0004] However, the above-mentioned pelletizing device has the following defects when in use:

[0005] 1. Since air cooling is used to cool plastic, the cooling efficiency is lower than that of water ring hot cutting and other methods, and it is easy to cause the problem of particle adhesion;

[0006] 2. Air cooling The air cooling structure of hot cutting generally sets an air cooling cover at the extrusion port, so that the wind source is concentrated to cool the newly extruded round strip plastic and the cut plastic particles. However, the internal structure of the existing air cooling cover is relatively simple, which is just a simple sealing cover, and the air source cannot be concentratedly guided to the extrusion position of the plastic strip, resulting in that the plastic strip and plastic particles cannot be well cooled;

[0007] 3. Since the traditional pelletizing device is installed at the granulating head of the extruder, once the extrusion hole of the granulating head is blocked, the pelletizing device needs to be dismantled, and then the extrusion hole is cleaned and dredged, and then it is assembled, which causes considerable obstacles to the maintenance of the equipment and affects the normal processing efficiency. Summary of the invention

[0008] The purpose of the present invention is to provide a PVC plastic particle regeneration rapid pelletizing device and method, which can improve the cooling efficiency by combining water cooling and air cooling, and at the same time change the internal structure of the air cooling cover to make the wind source more concentrated, accelerate the cooling of the extruded plastic strips, and enable the cut plastic particles to be fully cooled without mutual adhesion.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A PVC plastic particle regeneration and rapid pelletizing device, comprising:

[0011] A cutting assembly, comprising a servo motor for providing pelletizing power and a shaft head base connected to the power output end of the servo motor, wherein a cutting mechanism is installed on the shaft head base;

[0012] An air cooling cover is wrapped around the power output end of the servo motor, an air inlet is arranged on one side of the bottom end of the air cooling cover, and a symmetrical guide plate and an isolation plate are integrally formed inside the cover;

[0013] A receiving hopper is arranged at the bottom of the air-cooling cover and is used to receive plastic particles. A screening mechanism is arranged inside the receiving hopper, and a discharge pipe port is integrally formed at the bottom of the receiving hopper.

[0014] A blower is arranged on one side of the air-cooling hood, and an air outlet is connected to the air inlet through a pipeline;

[0015] A storage tank, whose feed port is connected to the discharge port through a pipeline, and is used to collect the cut particles;

[0016] A granulator head is installed at the extrusion port of the extruder, the granulator head is provided with an extrusion hole, and a water cooling circulation mechanism is arranged around the extrusion hole;

[0017] A cleaning needle is arranged around the periphery of the shaft head base and matches the extrusion hole. The cleaning needle is installed on the circumferential surface of the shaft head base through a supporting mechanism. A driving mechanism for pushing the cleaning needle is also arranged between the cleaning needle and the air cooling cover;

[0018] Among them, the PVC plastic particles are hot-melted in the extruder and extruded through the extrusion hole. During the extrusion process, they are cooled by a water-cooling circulation mechanism and an air-cooling system formed by an air-cooling hood and a blower, and are pelletized by a cutting mechanism. They are then separated by a screening mechanism and are collected in a storage tank under the influence of wind.

[0019] The cutting mechanism includes a fixing pin vertically fixedly mounted on the circumferential surface of the shaft head base, a blade is vertically fixedly mounted on the fixing pin, a coupling is mounted on the power output end of the servo motor, and the shaft head base is fixedly mounted on the power output end of the coupling.

[0020] The interior of the air-cooling hood is divided by the guide plate to form a central discharge channel in the center and air ducts on both sides, wherein the air ducts on both sides are connected to the air supply channels formed by the separation plates, and the air ducts are connected to the air inlet, and the top of the guide plate is bud-shaped and wrapped around the periphery of the granulator head.

[0021] The bottom opening of the central material discharging channel is communicated with the top opening of the material receiving hopper, and a corrugated rubber dust cover is installed between the top opening of the material receiving hopper and the bottom opening of the air cooling cover.

[0022] The screening mechanism includes a support ring seat integrally formed on the inner wall of the receiving hopper, a first sieve plate and a second sieve plate movably arranged inside the receiving hopper, spring shock absorbers are installed in a circumferential array between the support ring seat, the first sieve plate and the second sieve plate, the first sieve plate and the second sieve plate are stacked in a conical tower shape, and air holes are evenly opened on the outer surface, the first sieve plate and the second sieve plate are surrounded by material discharge grooves at the bottom, the second sieve plate is provided with a screening opening at the top, and a vibration motor is fixedly installed at the center of the first sieve plate.

[0023] The water-cooling circulation mechanism includes an outer ring channel and an inner ring channel which are arranged around the inside of the granulator head. The inner ring channel surrounds the inner periphery of the extrusion hole, and the outer ring channel surrounds the outer periphery of the extrusion hole. The outer ring channel and the inner ring channel are connected to each other. An annular fluid is integrally formed on the periphery of the granulator head. A liquid inlet and a liquid outlet are arranged on the annular fluid. The liquid inlet and the liquid outlet are respectively connected to the extrusion hole and the outer ring channel.

[0024] The inner ring channel and the outer ring channel are both provided with baffle plates, and the baffle plates are alternately arrayed up and down on the inner walls of the outer ring channel and the inner ring channel to form an "S"-shaped matrix channel.

[0025] The supporting mechanism includes a slide groove opened on the outer surface of the shaft head base and a reciprocating bracket slidably installed inside the slide groove, a sliding sleeve is vertically welded on the top of the reciprocating bracket, the cleaning needle is slidably installed inside the sliding sleeve, a limiting sliding rod is fixedly installed inside the slide groove, the bottom end of the reciprocating bracket is slidably sleeved on the outer surface of the limiting sliding rod, a first return spring is fixedly installed between the side wall of the bottom end of the reciprocating bracket and the inner wall of the slide groove, and a second return spring is embedded and installed between the cleaning needle and the inner wall of the sliding sleeve.

[0026] The driving mechanism comprises a pushing cylinder fixedly mounted on the air-cooling cover, a pushing disk fixedly mounted on the power output end of the pushing cylinder, the pushing disk surrounds the periphery of the shaft head base, and the side surface corresponds to the cleaning needle.

[0027] A PVC plastic particle regeneration and rapid pelletizing method is applied to the above-mentioned PVC plastic particle regeneration and rapid pelletizing device, comprising the following steps:

[0028] Step 1: After the PVC plastic particles are hot-melted by the extruder, they are extruded through the extrusion hole to form plastic strips. During the extrusion process, coolant is input into the outer ring through the liquid inlet pipe port, and then circulates into the inner ring channel for water cooling again, and then flows out through the liquid outlet pipe port, absorbing the heat during the extrusion process of the plastic particles and accelerating their plasticity;

[0029] Step 2: While extruding in step 1, the blower starts to supply air through the pipe and into the air duct through the air inlet, so that the air source is transported to the periphery of the granulator head through the air ducts on both sides, flows around the granulator head, and air cools the extruded plastic strips and the cut plastic particles;

[0030] Step 3: While water cooling and air cooling are being performed in Step 1 and Step 2, the servo motor drives the shaft head base to rotate at high speed through the coupling, thereby driving the blade to cut the extruded plastic strips to complete the pelletizing work. At the same time, the wind source flowing through the pelletizing head blows the plastic particles out of the central discharge channel;

[0031] Step 4: The plastic particles discharged through the central discharge channel fall onto the surface of the first sieve plate and the second sieve plate through the top of the receiving hopper. At the same time, the vibration motor starts to drive the first sieve plate and the second sieve plate to vibrate, and the plastic particles are screened to avoid adhesion due to incomplete cooling. The screened plastic particles are blown by the wind source through the pipeline into the storage tank and collected;

[0032] Step 5. During routine inspection of the extrusion process, if the extrusion hole is found to be blocked, the servo motor can be used to drive the shaft head base to rotate and adjust the position of the cleaning needle so that it is aligned with the blocked extrusion hole. Then start the push cylinder, and use the push cylinder to push the cleaning needle into the extrusion hole through the push disk to clean the blocked plastic. After cleaning, the push cylinder drives the push disk to reset, and the cleaning needle is reset under the action of the rebound force of the first reset spring and the second reset spring to complete the cleaning work without hindering the subsequent pelletizing process.

[0033] The technical effects achieved by the present invention are:

[0034] The present invention arranges outer ring channels and outer ring channels above and below the extrusion hole, and is combined with an air cooling cover and a blower. When the plastic strip is extruded, the circulating coolant and the flowing wind source are used to take away the heat of the plastic strip, so that it is quickly cooled, thereby improving the cooling efficiency, reducing the problem of particles adhering to each other during cutting due to low efficiency, and also making the particle cutting effect better, the cutting more uniform, and reducing the occurrence of knife sticking.

[0035] The present invention forms an air duct and a central discharge channel inside the air cooling cover by arranging a guide plate and a separation plate inside the cutting assembly, so that the air source can be focused on the granulator head, so that the plastic particles can be quickly discharged through the central discharge channel under the drive of the air source. At the same time, the plastic particles can be fully cooled by the air source during the discharge process. The air source is focused on the granulator head to improve the cooling efficiency of the newly extruded plastic strips, and further improve the cooling performance of the device.

[0036] The present invention provides a screening mechanism to vibrate and screen the plastic particles during their falling process, thereby avoiding the problem of mutual adhesion due to insufficient cooling. The vibrating screening also increases the contact time between the particles and the wind source, thereby fully cooling the particles and ensuring that the particles have been cooled before entering the storage tank, so that the particles can reach storage conditions.

[0037] The present invention provides a cleaning needle, and when the extrusion hole is blocked, a servo motor can be used to drive the shaft head base to rotate and position it so that it is aligned with the blocked position. Then, a pushing cylinder is used to push the cleaning needle to clear the blocked extrusion hole. There is no need to disassemble the entire device and then clear the extrusion hole, which makes equipment maintenance more convenient, reduces unnecessary downtime, and improves processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of a partial three-dimensional structure of an embodiment of the present invention;

[0040] Figure 3 is a schematic structural diagram of a cutting assembly according to an embodiment of the present invention;

[0041] Figure 4 The present invention Figure 3 A top sectional view of

[0042] Figure 5 The present invention Figure 4 A partial enlarged view of;

[0043] Figure 6 It is a schematic structural diagram of a granulator head according to an embodiment of the present invention;

[0044] Figure 7 The present invention Figure 6 A top sectional view of

[0045] Figure 8 The present invention Figure 7 B is a partial enlarged view;

[0046] Fig. 9 It is a schematic diagram of the three-dimensional structure of the air cooling cover according to an embodiment of the present invention;

[0047] Fig.10 The present invention Fig. 9 A front cross-sectional view and a schematic diagram of the wind source flow direction;

[0048] Fig.11 The present invention Fig. 9 A side cross-sectional view of

[0049] Fig.12It is a structural schematic diagram of a receiving hopper according to an embodiment of the present invention;

[0050] Fig.13 The present invention Fig.12 Exploded diagram of

[0051] Fig.14 The present invention Figure 1 A top sectional view of

[0052] Fig.15 The present invention Fig.14 A partial enlarged view of C;

[0053] Fig.16 It is a schematic diagram of the structure of an embodiment of the present invention assembled with an extruder.

[0054] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0055] 1. Cutting assembly; 2. Air cooling cover; 3. Hopper; 4. Blower; 5. Storage tank; 6. Granulator head; 7. Cleaning needle; 8. Extruder;

[0056] 11. Servo motor; 12. Coupling; 13. Shaft head base; 14. Fixing pin; 15. Blade;

[0057] 21. Bearing seat; 22. Air inlet; 23. Fixed seat; 24. Guide vane; 25. Air duct; 26. Central discharge channel; 27. Isolation plate; 28. Air supply channel;

[0058] 31. Corrugated rubber dust cover; 32. Discharge pipe; 33. Support ring seat; 34. First sieve plate; 35. Second sieve plate; 36. Spring shock absorber; 37. Discharge slot; 38. Air vent; 39. Screen opening; 310. Vibration motor;

[0059] 61, extrusion hole; 62, outer annular channel; 63, inner annular channel; 64, baffle ring plate; 65, annular fluid; 66, liquid inlet pipe port; 67, liquid outlet pipe port;

[0060] 71. Slide groove; 72. Reciprocating bracket; 73. Limiting slide rod; 74. First return spring; 75. Sliding sleeve; 76. Second return spring; 77. Pushing plate; 78. Pushing cylinder. DETAILED DESCRIPTION

[0061] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0062] like Figure 1-16As shown, a PVC plastic particle regeneration and rapid pelletizing device comprises a cutting assembly 1, a pelletizing head 6 installed at the extrusion port of an extruder 8, an air-cooling cover 2 wrapped around the pelletizing head 6 and the cutting part, a receiving hopper 3 arranged at the bottom of the air-cooling cover 2 for receiving plastic particles, a blower 4 connected to the air-cooling cover 2 for providing an air source, and a storage tank 5 connected to the receiving hopper 3 through a pipeline;

[0063] Among them, an extrusion hole 61 is opened on the granulator head 6. By being installed at the extrusion port of the extruder 8, the PVC plastic in the molten state can be extruded from the extrusion hole 61 under pressure into strips, and then pelletized by the cutting component 1. At the same time, a discharge pipe port 32 is integrally formed at the bottom of the receiving hopper 3, which is connected to the feed port of the storage tank 5 through a pipeline, and after receiving the plastic particles, it is transported to the storage tank 5 through the pipeline.

[0064] Refer to the attached Figure 2-3 The cutting assembly 1 includes a servo motor 11 for providing pelletizing power and a shaft head base 13 connected to the power output end of the servo motor 11, a fixing pin 14 is vertically fixedly installed on the circumferential surface of the shaft head base 13, a blade 15 is vertically fixedly installed on the fixing pin 14, a coupling 12 is installed on the power output end of the servo motor 11, and the shaft head base 13 is fixedly installed on the power output end of the coupling 12;

[0065] According to the above structure, by fitting the cutting edge of the blade 15 to the outer surface of the granulator head 6 and starting the servo motor 11, the blade 15 can be driven to rotate at high speed through the coupling 12 by the servo motor 11 to pelletize the newly extruded plastic strips.

[0066] Refer to the attached Figure 1 as well as Figure 9-11An air inlet 22 is provided on one side of the bottom end of the air-cooling cover 2, and a symmetrical guide plate 24 and a partition plate 27 are integrally formed inside. The air outlet of the blower 4 is connected to the air inlet 22 through a pipeline. At the same time, the inside of the air-cooling cover 2 is separated by the guide plate 24 to form a central discharge channel 26 located in the center and air ducts 25 located on both sides. The air ducts 25 located on both sides are connected by air supply channels 28 formed by separating the isolation plates 27. The air ducts 25 are connected to the air inlet 22, and the top of the guide plate 24 is bud-shaped and wrapped around the periphery of the granulator head 6. When the blower 4 generates a wind source, it will enter the air duct 25 on one side through the air inlet 22 and pass through the air supply channel 28. The wind channel 28 enters the inside of the wind channel 25 on the other side, and then is transported to the position of the granulator head 6 through the two wind channels 25, so as to form a surrounding convection around the granulator head 6, and the plastic strips just extruded and the cut plastic particles are fully cooled, and then the plastic particles are carried out through the central discharge channel 26. Compared with the traditional air-cooled cover 2, the wind source can be focused on the granulator head 6, so that the plastic particles can be quickly discharged through the central discharge channel 26 under the drive of the wind source. At the same time, the plastic particles can also be fully cooled by the wind source during the discharge process. The wind source is focused on the granulator head 6 to improve the cooling efficiency of the just extruded plastic strips;

[0067] Furthermore, in order to facilitate the installation of the coupling 12 , a bearing seat 21 is installed at the center of the side of the air cooling cover 2 . The coupling 12 is installed inside the bearing seat 21 , which facilitates the rotation and improves the sealing performance of the air cooling cover 2 .

[0068] Refer to the attached Figure 6-8 In order to further improve the cooling efficiency, an outer ring channel 62 and an inner ring channel 63 are provided inside the granulator head 6. The inner ring channel 63 surrounds the inner periphery of the extrusion hole 61, and the outer ring channel 62 surrounds the outer periphery of the extrusion hole 61. The outer ring channel 62 and the inner ring channel 63 are connected to each other. At the same time, an annular fluid 65 is integrally formed on the periphery of the granulator head 6. A liquid inlet pipe port 66 and a liquid outlet pipe port 67 are provided on the annular fluid 65. The liquid inlet pipe port 66 and the liquid outlet pipe port 67 are connected to the extrusion hole 61 and the outer ring channel 62 respectively. The cooling liquid is connected to the outer annular channel 62 through the liquid inlet 66, and the cooling liquid is connected to the cooling liquid recovery device (not shown in the figure) through the liquid outlet 67. The cooling liquid is input from the liquid inlet 66 to the outer annular channel 62, and then circulates into the inner annular channel 63 for further circulation, and repeatedly absorbs the heat of the plastic in the extrusion hole 61 during plasticization, so that the plasticization is faster and the cooling efficiency is improved. After the heat is absorbed, it flows out through the liquid outlet 67 to complete the water cooling process.

[0069] Furthermore, in order to ensure that the coolant can be fully utilized, baffle plates 64 are provided inside the inner ring channel 63 and the outer ring channel 62. The baffle plates 64 are alternately arrayed up and down on the inner walls of the outer ring channel 62 and the inner ring channel 63 to form an "S"-shaped matrix channel, so that the flow velocity of the coolant in the inner ring channel 63 and the outer ring channel 62 is reduced, and the shaping heat can be fully absorbed, thereby improving the utilization rate of the coolant and reducing the waste of resources.

[0070] Refer to the attached Figure 12-15 In order to prevent the plastic particles from adhering to each other after cutting, a support ring seat 33 is integrally formed on the inner wall of the receiving hopper 3, and a first sieve plate 34 and a second sieve plate 35 are movably arranged inside the receiving hopper 3. A spring damper 36 is installed in a circumferential array between the support ring seat 33, the first sieve plate 34 and the second sieve plate 35, and the first sieve plate 34 and the second sieve plate 35 are stacked in a conical tower shape, and air holes 38 are evenly opened on the outer surface, so that the air flow can pass smoothly. A material discharge slot 37 is provided around the first sieve plate 34, a screening port 39 is provided at the top of the second sieve plate 35, and a vibration motor 310 is fixedly installed at the center of the first sieve plate 34, so that when the plastic particles fall, they can fall onto the surfaces of the first sieve plate 34 and the second sieve plate 35. At the same time, the vibration motor 310 is started to drive the first sieve plate 34 and the second sieve plate 35 to vibrate, so as to screen the plastic particles to avoid adhesion due to incomplete cooling. After screening, the plastic particles are blown by the wind source through the pipeline into the storage tank 5 to be collected;

[0071] Furthermore, in order to prevent dust and avoid leakage of plastic particles, the bottom of the central discharge channel 26 is connected to the top of the receiving hopper 3, and a corrugated rubber dust cover 31 is installed between the top of the receiving hopper 3 and the bottom of the air-cooling hood 2. While ensuring the sealing, it can be deformed according to the vibration and will not affect the screening of the plastic particles.

[0072] Refer to the attached Figure 2-5 In this embodiment, a cleaning needle 7 is also included, which is arranged around the periphery of the shaft head base 13 and matches the extrusion hole 61, and is used to clean the extrusion hole 61 blocked by the molten plastic;

[0073] Furthermore, in order to install the cleaning needle 7, a slide groove 71 is provided on the outer surface of the shaft head base 13, and a reciprocating bracket 72 is slidably installed inside the slide groove 71. A sliding sleeve 75 is vertically welded to the top of the reciprocating bracket 72. The cleaning needle 7 is slidably installed inside the sliding sleeve 75. A limited sliding rod 73 is fixedly installed inside the slide groove 71. The bottom end of the reciprocating bracket 72 is slidably sleeved on the outer surface of the limited sliding rod 73. A first return spring 74 is fixedly installed between the side wall of the bottom end of the reciprocating bracket 72 and the inner wall of the slide groove 71. A second return spring 76 is embedded and installed between the cleaning needle 7 and the inner wall of the sliding sleeve 75.

[0074] Furthermore, in order to push the cleaning needle 7 to clean the extrusion hole 61, a push cylinder 78 is fixedly installed on the air cooling cover 2, and a fixing seat 23 is provided on the side of the air cooling cover 2 for installing the push cylinder 78. A push disk 77 is fixedly installed on the power output end of the push cylinder 78, and the push disk 77 surrounds the periphery of the shaft head base 13, and the side surface corresponds to the cleaning needle 7;

[0075] According to the above structure, when the extrusion hole 61 needs to be cleaned, the control program can be used to control the servo motor 11 to drive the shaft head base 13 to rotate and adjust the position of the cleaning needle 7 so that it is aligned with the blocked extrusion hole 61, and then the pushing cylinder 78 is started. The pushing cylinder 78 uses the pushing disk 77 to push the cleaning needle 7 into the extrusion hole 61 to clean the blocked plastic. The first return spring 74 and the second return spring 76 will be compressed during the pushing process. After cleaning, the pushing cylinder 78 drives the pushing disk 77 to reset, and the cleaning needle 7 is reset under the action of the rebound force of the first return spring 74 and the second return spring 76 to complete the cleaning work. At the same time, it will not hinder the subsequent pelletizing process. There is no need to disassemble the entire device and then dredge the extrusion hole 61, which makes equipment maintenance more convenient, reduces unnecessary downtime, and improves processing efficiency.

[0076] In this embodiment, three groups of cleaning needles 7 are evenly arranged according to the gaps of the extrusion holes 61. In other embodiments, only one group or multiple groups may be arranged, which can be selected according to needs and matched with different positioning control programs.

[0077] Of course, in other embodiments, the cleaning needle 7 may not be provided, and the extrusion hole 61 may be cleaned using a conventional cleaning method.

[0078] A PVC plastic particle regeneration and rapid pelletizing method is applied to the above-mentioned PVC plastic particle regeneration and rapid pelletizing device, comprising the following steps:

[0079] Step 1: After the PVC plastic particles are hot-melted by the extruder 8, they are extruded through the extrusion hole 61 to form plastic strips. During the extrusion process, coolant is input into the outer ring channel 62 through the liquid inlet pipe 66, and then circulates into the inner ring channel 63 for water cooling again. Then, the coolant flows out through the liquid outlet pipe 67, absorbing the heat during the extrusion process of the plastic particles and accelerating their plasticity.

[0080] Step 2: At the same time as the extrusion molding in step 1, the blower 4 is started to supply air through the pipeline and into the air duct 25 through the air inlet 22, so that the air source is transported to the periphery of the granulator head 6 through the air ducts 25 on both sides, flows around the granulator head 6, and air cools the extruded plastic strips and the cut plastic particles;

[0081] Step 3: While water cooling and air cooling are being performed in step 1 and step 2, the servo motor 11 drives the shaft head base 13 to rotate at high speed through the coupling 12, thereby driving the blade 15 to cut the extruded plastic strips to complete the pelletizing work, and at the same time, the wind source flowing through the pelletizing head 6 blows the plastic particles out of the central discharge channel 26;

[0082] Step 4: The plastic particles discharged through the central discharge channel 26 fall onto the surfaces of the first sieve plate 34 and the second sieve plate 35 through the top of the receiving hopper 3. At the same time, the vibration motor 310 is started to drive the first sieve plate 34 and the second sieve plate 35 to vibrate, and the plastic particles are screened to avoid adhesion due to incomplete cooling. The screened plastic particles are blown by the wind source through the pipeline into the storage tank 5 to be collected;

[0083] Step 5. During routine inspection of the extrusion process, if the extrusion hole 61 is found to be blocked, the servo motor 11 can be used to drive the shaft head base 13 to rotate and adjust the position of the cleaning needle 7 so that it is aligned with the blocked extrusion hole 61. Then, the push cylinder 78 is started. The cleaning needle 7 is pushed by the push cylinder 78 to be inserted into the extrusion hole 61 to clean the blocked plastic. After cleaning, the push cylinder 78 is reset, and the cleaning needle 7 is reset under the action of the rebound force of the first reset spring 74 and the second reset spring 76, thereby completing the cleaning work without hindering the subsequent pelletizing process.

[0084] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A PVC plastic particle regeneration and rapid pelletizing device, characterized in that: include: A cutting assembly (1), comprising a servo motor (11) for providing pelletizing power and a shaft head base (13) connected to a power output end of the servo motor (11), wherein a cutting mechanism is mounted on the shaft head base (13); An air cooling cover (2) is wrapped around the power output end of the servo motor (11), an air inlet (22) is provided on one side of the bottom end of the air cooling cover (2), and a symmetrical guide plate (24) and an isolation plate (27) are integrally formed inside; A receiving hopper (3) is arranged at the bottom of the air-cooling cover (2) and is used to receive plastic particles. A screening mechanism is arranged inside the receiving hopper (3), and a discharge pipe opening (32) is integrally formed at the bottom of the receiving hopper (3); A blower (4) is arranged on one side of the air cooling cover (2), and an air outlet is connected to the air inlet (22) via a pipeline; A material storage tank (5), whose feed port is connected to the discharge pipe port (32) via a pipeline and is used to collect the cut particles; A granulator head (6) is mounted on the extrusion port of the extruder (8), the granulator head (6) is provided with an extrusion hole (61), and a water cooling circulation mechanism is arranged around the extrusion hole (61); A cleaning needle (7) is circumferentially arranged on the periphery of the shaft head base (13) and matches the extrusion hole (61); the cleaning needle (7) is mounted on the circumferential surface of the shaft head base (13) via a supporting mechanism; and a driving mechanism for pushing the cleaning needle (7) is also arranged between the cleaning needle (7) and the air cooling cover (2); The support mechanism comprises a slide groove (71) provided on the outer surface of the shaft head base (13) and a reciprocating bracket (72) slidably mounted inside the slide groove (71); a sliding sleeve (75) is vertically welded to the top of the reciprocating bracket (72); the cleaning needle (7) is slidably mounted inside the sliding sleeve (75); a limit sliding rod (73) is fixedly mounted inside the slide groove (71); the bottom end of the reciprocating bracket (72) is slidably sleeved on the outer surface of the limit sliding rod (73); a first return spring (74) is fixedly mounted between the side wall of the bottom end of the reciprocating bracket (72) and the inner wall of the slide groove (71); and a second return spring (76) is embedded and mounted between the cleaning needle (7) and the inner wall of the sliding sleeve (75); The PVC plastic particles are hot-melted in the extruder (8) and extruded through the extrusion hole (61). During the extrusion process, they are cooled by a water-cooling circulation mechanism and an air-cooling system formed by an air-cooling hood (2) and a blower (4). They are diced by a cutting mechanism, separated by a screening mechanism, and then blown into a storage tank (5) to be collected.

2. A PVC plastic particle regeneration and rapid pelletizing device according to claim 1, characterized in that: The cutting mechanism comprises a fixing pin (14) vertically fixedly mounted on the circumferential surface of the shaft head base (13), a blade (15) vertically fixedly mounted on the fixing pin (14), a coupling (12) mounted on the power output end of the servo motor (11), and the shaft head base (13) fixedly mounted on the power output end of the coupling (12).

3. A PVC plastic particle regeneration and rapid pelletizing device according to claim 1, characterized in that: The interior of the air-cooling hood (2) is divided by the guide plate (24) to form a central discharge channel (26) located in the center and air ducts (25) located on both sides, wherein the air ducts (25) located on both sides are connected to the air supply channels (28) formed by dividing the air ducts (28) by the isolation plates (27), and the air ducts (25) are connected to the air inlet (22), and the top end of the guide plate (24) is in a bud shape and wraps around the periphery of the granulator head (6).

4. A PVC plastic particle regeneration and rapid pelletizing device according to claim 3, characterized in that: The bottom opening of the central discharge channel (26) is communicated with the top opening of the receiving hopper (3), and a corrugated rubber dust cover (31) is installed between the top opening of the receiving hopper (3) and the bottom opening of the air cooling cover (2).

5. A PVC plastic particle regeneration and rapid pelletizing device according to claim 1, characterized in that: The screening mechanism comprises a support ring seat (33) integrally formed on the inner wall of the receiving hopper (3), a first sieve plate (34) and a second sieve plate (35) movably arranged inside the receiving hopper (3), spring dampers (36) being installed in a circumferential array between the support ring seat (33), the first sieve plate (34) and the second sieve plate (35), the first sieve plate (34) and the second sieve plate (35) being stacked in a conical tower shape, and having air holes (38) uniformly opened on the outer surface, a material discharge groove (37) being opened around the bottom of the first sieve plate (34) and the second sieve plate (35), a screening opening (39) being opened at the top of the second sieve plate (35), and a vibration motor (310) being fixedly installed at the center of the first sieve plate (34).

6. A PVC plastic particle regeneration and rapid pelletizing device according to claim 1, characterized in that: The water cooling circulation mechanism comprises an outer ring channel (62) and an inner ring channel (63) which are arranged around the interior of the granulator head (6); the inner ring channel (63) surrounds the inner periphery of the extrusion hole (61); the outer ring channel (62) surrounds the outer periphery of the extrusion hole (61); the outer ring channel (62) and the inner ring channel (63) are interconnected; an annular fluid (65) is integrally formed on the periphery of the granulator head (6); a liquid inlet pipe opening (66) and a liquid outlet pipe opening (67) are arranged on the annular fluid (65); the liquid inlet pipe opening (66) and the liquid outlet pipe opening (67) are respectively connected to the extrusion hole (61) and the outer ring channel (62).

7. A PVC plastic particle regeneration and rapid pelletizing device according to claim 6, characterized in that: The inner annular channel (63) and the outer annular channel (62) are both provided with baffle plates (64), and the baffle plates (64) are arranged alternately up and down on the inner walls of the outer annular channel (62) and the inner annular channel (63), forming an "S"-shaped matrix channel.

8. A PVC plastic particle regeneration and rapid pelletizing device according to claim 1, characterized in that: The driving mechanism comprises a push cylinder (78) fixedly mounted on the air cooling cover (2), a push disk (77) fixedly mounted on the power output end of the push cylinder (78), the push disk (77) surrounding the outer periphery of the shaft head base (13), and the side surface of the push disk corresponds to the cleaning needle (7).

9. A method for rapid pelletizing of PVC plastic particles, applied to a device for rapid pelletizing of PVC plastic particles according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: After the PVC plastic particles are hot-melted by the extruder (8), they are extruded through the extrusion hole (61) to form plastic strips. During the extrusion process, coolant is input into the outer ring channel (62) through the liquid inlet pipe (66), and then circulates into the inner ring channel (63) for water cooling again. The coolant then flows out through the liquid outlet pipe (67), absorbing the heat during the extrusion process of the plastic particles and accelerating their plasticity. Step 2: While the extrusion molding is being performed in step 1, the blower (4) is started to supply air through the pipeline and into the air duct (25) through the air inlet (22), thereby conveying the air source to the periphery of the granulator head (6) through the air ducts (25) on both sides, flowing around the granulator head (6), and air-cooling the extruded plastic strips and the cut plastic particles; Step 3: While water cooling and air cooling are being performed in Step 1 and Step 2, the servo motor (11) drives the shaft head base (13) to rotate at high speed through the coupling (12), thereby driving the blade (15) to cut the extruded plastic strips to complete the pelletizing work, and at the same time, the wind source flowing through the pelletizing head (6) blows the plastic particles out from the central discharge channel (26); Step 4: The plastic particles discharged through the central discharge channel (26) fall onto the surfaces of the first sieve plate (34) and the second sieve plate (35) through the top opening of the receiving hopper (3). At the same time, the vibration motor (310) is started to drive the first sieve plate (34) and the second sieve plate (35) to vibrate, thereby screening the plastic particles to prevent adhesion due to incomplete cooling. The screened plastic particles are blown by the wind source through the pipeline into the storage tank (5) to be collected. Step 5: During routine inspection of the extrusion process, if the extrusion hole (61) is found to be clogged, the servo motor (11) can be used to drive the shaft head base (13) to rotate and adjust the position of the cleaning needle (7) so that it is aligned with the clogged extrusion hole (61). Then, the push cylinder (78) is started, and the push cylinder (78) uses the push disk (77) to push the cleaning needle (7) into the extrusion hole (61) to clean the clogged plastic. After cleaning, the push cylinder (78) drives the push disk (77) to reset, and the cleaning needle (7) is reset under the action of the rebound force of the first reset spring (74) and the second reset spring (76), completing the cleaning work without hindering the subsequent pelletizing process.

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