Extrusion device for plastic product processing

Abstract

An extrusion device for plastic product processing comprises a machine head, a material mixing barrel and a heat preservation sleeve, a heating barrel is arranged on the side, close to the material mixing barrel, of the outer wall of the heat preservation sleeve, one end of the heating barrel is connected with an external air supply device, and the other end of the heating barrel is communicated into the material mixing barrel; the thermal insulation sleeve can heat airflow in the heating cylinder to a set temperature, heat particle raw materials in the mixing cylinder through the hot airflow and dry moisture in particles, so that the moisture and some volatile components in the particle raw materials can be removed in advance to a large extent, and the particle raw materials are uniformly mixed. And meanwhile, the gas extruded in the compaction process of the plastic particles in the machine head can flow and be discharged into the heating cylinder more easily, the gas among the plastic particles is promoted to be discharged, and the gas generated when the plastic is in a molten state is less.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic extrusion, and in particular relates to an extrusion device for processing plastic products. Background Art

[0002] Plastic extruder is an important polymer material processing equipment. It mainly refers to a molding method that uses the extrusion effect of a screw or a plunger to force the heated and molten polymer material through the die head under pressure to form a continuous profile with a constant cross-section. The process mainly includes the steps of feeding, melt plasticization, extrusion molding, shaping and cooling. Its function is to heat and melt the plastic raw materials, and then continuously produce plastic profiles with a constant cross-section, such as pipes, plates, bars, etc., through the above-mentioned screw pushing and mold molding.

[0003] Plastic pellet raw materials may contain moisture, residual solvents or other low molecular weight compounds. These components evaporate when heated during the extrusion process to form volatile gases, which contain relatively more moisture. Currently, the exhaust ports of extruders are mostly located at one end close to the die head. In other sections of the non-exhaust area, these gases generated by the plastic pellets during melting will form bubbles or voids, affecting the fluidity and uniformity of the melt, and thus affecting the melting and mixing effect of the plastic. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide an extrusion device for processing plastic products, so as to at least partially solve the problems raised in the above background technology.

[0005] The technical solution adopted by the present invention is as follows: an extrusion device for processing plastic products is proposed, comprising: A machine head, the machine head comprising a barrel arranged above a frame and a screw rotatably installed in the barrel, and a heat-insulating sleeve is fixedly arranged on the outer side of the barrel; A driver, disposed on the frame and used to drive the screw to rotate in the barrel; A mixing cylinder, arranged above the inlet end of the die, and used for inputting granular raw materials into the die; A die head, fixedly mounted on the head end of the die head; Among them, a heating cylinder is provided on the outer wall of the insulation sleeve close to the mixing barrel. One end of the heating cylinder is connected to an external air supply device, and the other end is connected to the mixing barrel. The insulation sleeve can heat the air flow in the heating cylinder to a set temperature, and heat the granular raw materials in the mixing barrel through the hot air flow, so that the granular raw materials can be dehumidified during mixing and feeding in the mixing barrel.

[0006] The heating cylinder includes an air cylinder and a guide portion attached to the outer wall of the insulation sleeve, the guide portion is configured with a plurality of grooves along the axial direction, one end of the air cylinder is connected to an external air supply device through an air inlet pipe, and the other end is connected to the mixing cylinder through an air guide pipe, so that the airflow entering the air cylinder passes through the guide portion and is then introduced into the mixing cylinder from the air guide pipe.

[0007] Furthermore, the mixing barrel comprises a barrel and a stirrer rotatably mounted in the middle of the barrel, a motor for driving the stirrer to rotate is fixedly mounted on the top of the barrel, a feeding auger is fixedly connected to the bottom of the stirrer, the air guide pipe is located at the lower end of the feeding auger, and the airflow direction of the air guide pipe is opposite to the direction in which the feeding auger feeds the granular raw material; A feed pipe and an exhaust pipe are fixedly provided on the outer side wall of the top end of the barrel. The feed pipe and the exhaust pipe are located on opposite sides. The feed pipe is communicated with a discharge port of an external feeding mechanism.

[0008] Furthermore, a plurality of evenly distributed through holes are provided on the surface of the unloading auger, and the aperture of the through holes is smaller than the particle diameter of the granular raw material.

[0009] Furthermore, the screw is provided with a first section, a second section, a third section and a fourth section in sequence along the material conveying direction, and the insulation sleeve is provided with a first insulation zone, a second insulation zone, a third insulation zone and a fourth insulation zone in the axial direction corresponding to the first section, the second section, the third section and the fourth section, respectively, and the temperatures of the first insulation zone, the second insulation zone, the third insulation zone and the fourth insulation zone increase in sequence, and an exhaust pipe is provided on the outer wall of the barrel corresponding to the fourth section.

[0010] Furthermore, the insulation sleeve includes a heating tube and a cooling tube, the first insulation zone and the second insulation zone are each provided with an independent heating tube, and the third insulation zone and the fourth insulation zone are provided with heating tubes and cooling tubes alternately along the axial cycle to maintain the third insulation zone and the fourth insulation zone at a set target temperature, and the axial length of the heating tube and the cooling tube in the fourth insulation zone is shorter than that in the third insulation zone.

[0011] Furthermore, a screw groove is provided on the outer wall of the screw, and the screw groove includes a first screw groove, a second screw groove, a third screw groove and a fourth screw groove. In the machine head, the direction in which the mixing barrel moves toward the die head is set as a first direction, and the opposite direction is set as a second direction. The first screw groove is configured to feed the granular raw material along the spiral surface of the screw toward the first direction, the second screw groove is configured to feed the granular raw material along the spiral surface of the screw toward the second direction, the third screw groove is configured to feed the granular raw material along the spiral surface of the screw toward the first direction, and the granular raw material passes through the screw radially, and the fourth screw groove is configured to feed the granular raw material along the spiral surface of the screw toward the first direction.

[0012] Further, the first screw groove and the second screw groove are both arranged on the outer walls of the first section, the second section and the third section, the third screw groove is arranged on the outer wall of the third section, and the fourth screw groove is arranged on the outer wall of the fourth section; Among them, the ratio of the first screw groove to the second screw groove on the outer wall of the first section is greater than the ratio of the first screw groove to the second screw groove on the outer wall of the second section, and the depth of the fourth screw groove is less than the depth of the first screw groove.

[0013] Furthermore, the third screw groove includes a circumferential groove and a radial groove, the radial groove is spirally distributed along the surface of the screw, the radial groove radially penetrates the screw, and a stopper is provided on the radial groove corresponding to the rear side of the circumferential groove, so that the material in the radial groove can enter the circumferential groove.

[0014] Furthermore, a broken groove penetrating through two adjacent second screw grooves in the axial direction is provided on the surface wall of the screw.

[0015] Beneficial effects: By arranging a heating cylinder on the side close to the mixing cylinder and introducing high-temperature airflow into the mixing cylinder through the heating cylinder, when the airflow contacts the plastic particles, the particles will be preheated as a whole and the moisture in the particles will be dried. This can largely remove the moisture and some volatile components in the particle raw materials in advance, and reduce the gas generated when the plastic particles are melted in the machine head. At the same time, the gas squeezed out during the compaction of the plastic particles in the machine head is more likely to flow and be discharged into the heating cylinder, which promotes the discharge of gas between the plastic particles and makes the gas in the molten state of the plastic less. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of an extrusion device for processing plastic products proposed in an embodiment of the present invention; Figure 2 A schematic side view of the structure of an extrusion device for processing plastic products proposed in an embodiment of the present invention; Figure 3 A schematic diagram of the internal structure of the machine head is provided for an embodiment of the present invention; Figure 4 A schematic side view of a screw rod according to an embodiment of the present invention is provided; Figure 5 A schematic side view of a first section and a second section of a screw rod is provided for an embodiment of the present invention; Figure 6 A side view schematic diagram of the third section and the fourth section of the screw is provided for an embodiment of the present invention; Figure 7 The present invention provides a schematic cross-sectional structure diagram of a third screw groove in a screw rod according to an embodiment of the present invention.

[0017] Among them, 01, frame; 10, head; 11, barrel; 12, screw; 121, first section; 122, second section; 123, third section; 124, fourth section; 13, insulation sleeve; 1301, heating cylinder; 1302, cooling cylinder; 131, first insulation zone; 132, second insulation zone; 133, third insulation zone; 134, fourth insulation zone; 14, exhaust pipe; 15, temperature sensor; 20, driver; 21, reducer; 30. Mixing barrel; 31. Barrel; 311. Feed pipe; 312. Exhaust pipe; 32. Agitator; 33. Unloading auger; 34. Motor; 40. Heating barrel; 41. Air cylinder; 411. Flow guide; 42. Air inlet pipe; 43. Air guide pipe; 50. Die head; 60. Screw groove; 61. First screw groove; 62. Second screw groove; 620. Broken groove; 63. Third screw groove; 630. Circumferential groove; 631. Radial groove; 632. Stopper; 64. Fourth screw groove.

[0018] The accompanying drawings are used to provide further understanding of the embodiments and constitute a part of the specification. They are used for explanation together with the embodiments and do not constitute a limitation of the embodiments. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection.

[0020] In the description of the embodiments, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments.

[0021] In the die head 10 of the extruder, the plastic granule raw material is heated and melted to form a melt. If the melt contains gas, these gases will form bubbles or voids, thereby affecting the fluidity and uniformity of the melt. The presence of gas may cause the flow of the melt in the screw 12 and the barrel 11 to become unstable, or even produce turbulence, thereby affecting the melting and mixing effect of the plastic. It should be understood that the raw material contains volatile additives such as plasticizers, which may also vaporize and produce gas at high temperatures, but relative to water vapor, its content may be less, so eliminating water vapor in the granule raw material can greatly reduce the gas entering the die head 10.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides an extrusion device for processing plastic products, which aims to eliminate water vapor in the granular raw materials in the mixing barrel 30 to prevent the water vapor from following the granular raw materials into the head 10 and affecting the mixing effect of the subsequent molten materials. The device mainly includes the head 10, the driver 20, the mixing barrel 30, the die 50 and the heating barrel 40.

[0023] The machine head 10 includes a barrel 11 arranged above the frame 01 and a screw 12 rotatably installed in the barrel 11. An insulation sleeve 13 is fixedly provided on the outer side of the barrel 11. The insulation sleeve 13 is used to heat the barrel 11 to melt the plastic particles between the barrel 11 and the screw 12.

[0024] Furthermore, the driver 20 is arranged on the frame 01, and is used to drive the screw 12 to rotate in the barrel 11. Generally, the driver 20 adopts an AC motor, and the output end of the driver 20 is also equipped with a reducer 21. After the high-speed speed of the AC motor is matched to a suitable speed, the screw 12 is driven to rotate. The mixing barrel 30 is usually arranged above the inlet end of the head 10, and is used to input granular raw materials into the head 10. The die head 50 is fixedly installed at the head end of the head 10. The die head 50 extrude the molten plastic in the head 10 through a specific channel, thereby giving the plastic product the desired shape, size and surface quality, while controlling the flow of the material and promoting further plasticization and densification.

[0025] Furthermore, a heating cylinder 40 is provided on the outer wall of the insulation sleeve 13 near the mixing cylinder 30. One end of the heating cylinder 40 is connected to the external air supply device, and the other end is connected to the mixing cylinder 30. The insulation sleeve 13 can heat the air flow in the heating cylinder 40 to a set temperature, and heat the granular raw materials in the mixing cylinder 30 through the hot air flow, so that the granular raw materials can be dehumidified during the mixing and feeding process in the mixing cylinder 30.

[0026] In some embodiments, the air flow in the heating barrel 40 needs to be heated to a set temperature of about 110°C. The air flow at this temperature is lower than the melting point of the granular raw material, which can maintain the granular state of the granular raw material and facilitate material feeding. At the same time, when the air flow contacts the granular raw material in the mixing barrel 30, it can preheat the granular raw material, promote the moisture on the surface of the granular raw material to form water vapor and discharge, and prevent water vapor from entering the machine head 10.

[0027] like Figure 3 As shown, the heating cylinder 40 includes an air cylinder 41 and a guide portion 411 attached to the outer wall of the insulation sleeve 13, the guide portion 411 is configured with a plurality of grooves along the axial direction, and in some embodiments, the air cylinder 41 adopts a hollow sleeve structure, and the annular sleeve is wrapped around the outer side of the insulation sleeve 13, and the grooves at the guide portion 411 can be configured as spiral or parallel annular grooves, which are intended to increase the area and duration of contact between the airflow and the insulation sleeve 13 during airflow, so that the airflow temperature can reach the set temperature.

[0028] Among them, one end of the air cylinder 41 is connected to the external air supply device through the air inlet pipe 42, and the other end is connected to the mixing barrel 30 through the air guide pipe 43, so that the air flow entering the air cylinder 41 is heated by the guide part 411 and then introduced into the mixing barrel 30 from the air guide pipe 43 to preheat and dehumidify the granular raw materials in the mixing barrel 30.

[0029] like Figure 3 As shown, the mixing barrel 30 includes a barrel 31 and an agitator 32 rotatably installed in the middle position of the barrel 31. A motor 34 for driving the agitator 32 to rotate is fixedly provided on the top of the barrel 31, wherein the upper half of the barrel 31 is constructed as a cylindrical body with a relatively large diameter, and the lower half is connected to the cylindrical body with a relatively small diameter through a narrowed conical structure. The agitator 32 is generally composed of an upright rod connected to the output shaft of the motor 34 and multiple horizontal rods. When the multiple horizontal rods rotate, the granular raw materials in the barrel 31 are stirred and mixed to achieve the purpose of preliminary mixing.

[0030] In some embodiments, a feed pipe 311 and an exhaust pipe 312 are fixedly provided on the outer side wall of the top end of the barrel 31, and the feed pipe 311 and the exhaust pipe 312 are located on opposite sides. The feed pipe 311 is connected to the discharge port of an external feeding mechanism. Generally, the feeding mechanism can adopt spiral feeding or negative pressure suction feeding, and the number of feed pipes 311 is set to one or more, arranged in the height direction or the horizontal direction. During feeding, plastic particle raw materials are synchronously supplied to the barrel 31. The exhaust pipe 312 is used to discharge the hot air in the barrel 31, and the hot air discharged by the exhaust pipe 312 can be circulated into the heating barrel 40 after dehumidification for use, so as to reduce heat energy loss.

[0031] Furthermore, a feeding auger 33 is fixedly connected to the bottom of the agitator 32. The feeding auger 33 is located in a cylindrical body with a relatively small diameter. The air guide pipe 43 is located at the lower end of the feeding auger 33, and the direction of the air flow discharged by the air guide pipe 43 is opposite to the direction in which the granular raw material is fed by the feeding auger 33. Therefore, the hot air flow discharged by the air guide pipe 43 will first contact the granular material at the lower end of the feeding auger 33, and then gradually contact the granular material accumulated in the barrel 31 upward, so that the granular material inside the barrel 31 is in an air flow atmosphere of a set temperature. When the air flow contacts the plastic particles, the particles will be preheated as a whole, and the moisture in the particles will be dried, and the water vapor will be discharged from the barrel 31 upward along the hot air flow. After preheating and drying, the granular raw materials are transported from the bottom of the barrel 31 into the machine head 10 by the feeding auger 33. In this way, the moisture and some volatile components in the granular raw materials can be removed in advance to a large extent, reducing the gas generated when the plastic particles are melted in the machine head 10.

[0032] In some embodiments, the surface of the unloading auger 33 is provided with a plurality of evenly distributed through holes, the aperture of which is smaller than the particle size of the granular raw material. Thus, the area of ​​the hot air flow passing through the unloading auger 33 is increased, so that the hot air can contact the granular raw material over a large area, thereby increasing the heating time of the granular raw material and fully evaporating the moisture in the plastic particles.

[0033] like Figure 3 and Figure 4 As shown, the screw 12 is provided with a first section 121 (feeding zone), a second section 122 (compression zone), a third section 123 (melting zone) and a fourth section 124 (infiltration zone) in sequence along the material conveying direction. The feeding zone is mainly used to compact and convey the plastic particles. The compression zone is used to further compact and plasticize the plastic, and to press the air entrained in the plastic back to the feeding port for discharge. The raw materials in the melting zone are heated to a molten state, and a certain pressure and rotation speed are maintained so as to melt the plastic particle raw materials uniformly. The plastic in the infiltration zone is further plasticized and extruded from the die head 50 at a constant pressure, quantity and temperature.

[0034] The insulation sleeve 13 is respectively provided with a first insulation zone 131, a second insulation zone 132, a third insulation zone 133 and a fourth insulation zone 134 along the axial direction corresponding to the first section 121, the second section 122, the third section 123 and the fourth section 124, and the temperatures of the first insulation zone 131, the second insulation zone 132, the third insulation zone 133 and the fourth insulation zone 134 increase successively. An exhaust pipe 14 is provided on the outer wall of the barrel 11 corresponding to the fourth section 124, and the exhaust pipe 14 and the exhaust pipe 312 are both connected to the external negative pressure device.

[0035] In some embodiments, the first insulation zone 131 is generally set to be 20-50°C lower than the melting point, and is set at about 110°C. The heating cylinder 40 is arranged on the outside of the first insulation zone 131. The temperature of the second insulation zone 132 is generally set in the range of 140-180°C. In order to ensure that the raw materials can flow well, the temperature of the third insulation zone 133 needs to be high enough to ensure that the material can be fully plasticized. Its setting range is generally 180-220°C, or 10-30°C higher than the melting point. The fourth insulation zone 134 is set in the range of 220-260°C, or 30-60°C higher than the melting point to ensure that the material reaches a uniform molten state before entering the die head 50.

[0036] Furthermore, the insulation sleeve 13 includes a heating cylinder 1301 and a cooling cylinder 1302. The first insulation zone 131 and the second insulation zone 132 are each provided with an independent heating cylinder 1301. The pressure and temperature of this temperature zone are relatively low and easy to maintain a stable state. Therefore, the heating cylinder 1301 is set to heat this area.

[0037] In the third insulation zone 133 and the fourth insulation zone 134, since the pressure and temperature are relatively high, the molten plastic is greatly affected by temperature and pressure factors. Therefore, this area needs to maintain a stable temperature value to prevent the plastic from adhering to the barrel 11, screw 12 or die head 50 due to high temperature.

[0038] Therefore, the third insulation zone 133 and the fourth insulation zone 134 are alternately and axially provided with heating cylinders 1301 and cooling cylinders 1302 to maintain the third insulation zone 133 and the fourth insulation zone 134 at the set target temperature, wherein the temperature value of the heating cylinder 1301 is higher than the temperature value of the cooling cylinder 1302 by within 30°C, and both the heating cylinder 1301 and the cooling cylinder 1302 can be heated by electric heating, hot oil, etc., and heat energy is also provided in the cooling cylinder 1302, but the temperature is lower than that of the heating cylinder 1301, in order to keep the molten material in the third insulation zone 133 and the fourth insulation zone 134 within a more stable and precise temperature range.

[0039] In some embodiments, temperature sensors 15 are installed on the inner wall of the barrel 11 to ensure accurate detection values ​​of the molten material. In order to achieve high-precision feedback on the temperature value of the molten plastic, a relatively large number of temperature sensors 15 are installed in the third insulation zone 133 and the fourth insulation zone 134, while a relatively small number of temperature sensors 15 are installed in the first insulation zone 131 and the second insulation zone 132.

[0040] Furthermore, in order to make the temperature control of the fourth insulation zone 134 more precise compared with the temperature control of the third insulation zone 133, the axial length of the heating tube 1301 and the cooling tube 1302 in the fourth insulation zone 134 is shorter than that in the third insulation zone 133, that is, in the area of ​​the fourth insulation zone 134, the axial dimension of the temperature control element (heating tube 1301 and cooling tube 1302) is smaller, so the temperature control range is finer, and a high-precision temperature control effect can be achieved.

[0041] like Figure 4 , Figure 5 and Figure 6 As shown, a screw groove 60 is provided on the outer wall of the screw 12, and the screw groove 60 includes a first screw groove 61, a second screw groove 62, a third screw groove 63 and a fourth screw groove 64. In the machine head 10, the direction in which the mixing barrel 30 moves toward the die head 50 is set as the first direction (i.e., the plastic conveying direction), and the opposite direction is set as the second direction. The first screw groove 61 is configured to feed the granular raw material in a spiral direction along the surface of the screw 12 in the first direction, the second screw groove 62 is configured to feed the granular raw material in a spiral direction along the surface of the screw 12 in the second direction, the third screw groove 63 is configured to feed the granular raw material in a spiral direction along the surface of the screw 12 in the first direction, and the granular raw material passes through the screw 12 radially, and the fourth screw groove 64 is configured to feed the granular raw material in a spiral direction along the surface of the screw 12 in the first direction.

[0042] The first screw groove 61 and the second screw groove 62 are both arranged on the outer walls of the first section 121 , the second section 122 and the third section 123 , the third screw groove 63 is arranged on the outer wall of the third section 123 , and the fourth screw groove 64 is arranged on the outer wall of the fourth section 124 .

[0043] Furthermore, the ratio of the first screw groove 61 to the second screw groove 62 on the outer wall of the first section 121 is greater than the ratio of the first screw groove 61 to the second screw groove 62 on the outer wall of the second section 122 , and the depth of the fourth screw groove 64 is less than the depth of the first screw groove 61 .

[0044] In some embodiments, the first screw groove 61 in the first section 121 is used to feed the plastic particles in a first direction, and the second screw groove 62 feeds the plastic particles in a second direction, so as to make the plastic particles closer together and squeeze the gas between the particles toward the inlet direction. The ratio of the axial length of the first screw groove 61 to the axial length of the second screw groove 62 is between 3 and 5. This process mainly receives the granular raw materials in the mixing barrel 30 and preliminarily compacts the plastic granular raw materials to prepare for plasticization in subsequent sections.

[0045] Among them, a broken groove 620 is provided on the surface wall of the screw 12, which penetrates two adjacent second screw grooves 62 in the axial direction. The setting of the broken groove 620 between the second screw grooves 62 can promote the flow of materials in the axial direction and promote the mixing of materials between different screw grooves.

[0046] In the second section 122, the ratio of the axial length of the first screw groove 61 to the axial length of the second screw groove 62 is between 2 and 3. This process is mainly to further compact the plastic granule raw material and discharge the air in the plastic granules, while causing the plastic to begin to soften.

[0047] Since the heating cylinder 40 introduces airflow into the mixing cylinder 30, during the process of the airflow flowing into the mixing cylinder 30, the pressure in the mixing cylinder 30 is relatively small compared to that in the machine head 10, while the pressure in the machine head 10 is relatively large. Therefore, the gas squeezed out during the compaction of the plastic particles in the first section 121 and the second section 122 is more likely to flow into the heating cylinder 40 and be discharged. In this way, the discharge of gas between the plastic particles is promoted, so that there is less gas in the molten state of the plastic.

[0048] In the third section 123, the first screw groove 61, the second screw groove 62 and the third screw groove 63 are mixed and distributed. Since the first screw groove 61 and the second screw groove 62 are both spirally distributed on the surface of the screw 12, the cooperation of the first screw groove 61 and the second screw groove 62 can only mix the materials in the axial direction, and the materials cannot be evenly distributed after mixing. Therefore, the third screw groove 63 is provided. The third screw groove 63 can mix the materials in the axial direction and the radial direction at the same time. In this way, the materials are evenly mixed and heated, and there is no problem of uneven heating and uneven mixing of the inner and outer layers.

[0049] like Figure 7 As shown, the third screw groove 63 includes a circumferential groove 630 and a radial groove 631. The radial groove 631 is spirally distributed along the surface of the screw 12. The radial groove 631 radially penetrates the screw 12. A stopper 632 is provided on the radial groove 631 at the rear side corresponding to the circumferential groove 630, so that the material in the radial groove 631 can enter the circumferential groove 630.

[0050] When the molten material flows into the third screw groove 63, it will first pass through the circumferential groove 630, flow in a spiral direction on the surface of the screw 12, and then heat the entrance of the radial groove 631. After being blocked by the block 632, it will all enter the radial groove 631, so that the material on one side of the surface of the screw 12 passes through the radial groove 631 to the opposite side and mixes with the material on the other side, thereby achieving the purpose of radial mixing of the material, thereby promoting the mixing of the energy materials.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] The above description of the implementation mode is not restrictive, and the drawings show only one of the implementation modes, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection.

Claims

1. An extrusion device for processing plastic products, characterized in that: include: A machine head (10), the machine head (10) comprising a barrel (11) arranged above a machine frame (01) and a screw (12) rotatably mounted in the barrel (11), and a heat-insulating sleeve (13) is fixedly provided on the outer side of the barrel (11); A mixing cylinder (30) disposed above the inlet end of the die head (10); A die head (50) fixedly mounted on the head end of the die head (10); A heating cylinder (40) is provided on the outer wall of the heat-insulating sleeve (13) near the mixing cylinder (30). One end of the heating cylinder (40) is connected to an external air supply device, and the other end is connected to the inside of the mixing cylinder (30). The heat-insulating sleeve (13) can heat the air flow in the heating cylinder (40) to a set temperature, and heat the granular raw materials in the mixing cylinder (30) through the hot air flow, so that the granular raw materials are dehumidified during mixing and feeding in the mixing cylinder (30).

2. The extrusion device for processing plastic products according to claim 1, characterized in that: The heating cylinder (40) comprises an air cylinder (41) and a flow guide portion (411) attached to the outer wall of the heat-insulating sleeve (13); the flow guide portion (411) is provided with a plurality of grooves along the axial direction; one end of the air cylinder (41) is connected to an external air supply device via an air inlet pipe (42), and the other end is connected to the mixing cylinder (30) via an air guide pipe (43), so that the airflow entering the air cylinder (41) passes through the flow guide portion (411) and is then introduced into the mixing cylinder (30) from the air guide pipe (43).

3. The extrusion device for processing plastic products according to claim 2, characterized in that: The mixing barrel (30) comprises a barrel (31) and a stirrer (32) rotatably mounted in the middle of the barrel (31); a motor (34) for driving the stirrer (32) to rotate is fixedly disposed on the top of the barrel (31); a feeding auger (33) is fixedly connected to the bottom of the stirrer (32); the air guide pipe (43) is located at the lower end of the feeding auger (33); and the direction of the air flow guided by the air guide pipe (43) is opposite to the direction in which the feeding auger (33) feeds the granular raw material; A feed pipe (311) and an exhaust pipe (312) are fixedly provided on the outer side wall of the top end of the barrel (31); the feed pipe (311) and the exhaust pipe (312) are located on opposite sides; the feed pipe (311) is connected to a discharge port of an external feeding mechanism.

4. The extrusion device for processing plastic products according to claim 3, characterized in that: The surface of the unloading auger (33) is provided with a plurality of evenly distributed through holes, and the aperture of the through holes is smaller than the particle diameter of the granular raw material.

5. The extrusion device for processing plastic products according to claim 1, characterized in that: The screw (12) is provided with a first section (121), a second section (122), a third section (123) and a fourth section (124) in sequence along the material conveying direction; the heat-insulating sleeve (13) is provided with a first heat-insulating zone (131), a second heat-insulating zone (132), a third heat-insulating zone (133) and a fourth heat-insulating zone (134) in the axial direction corresponding to the first section (121), the second section (122), the third section (123) and the fourth section (124), respectively; and the temperatures of the first heat-insulating zone (131), the second heat-insulating zone (132), the third heat-insulating zone (133) and the fourth heat-insulating zone (134) are increased in sequence; and an exhaust pipe (14) is provided on the outer wall of the barrel (11) at a position corresponding to the fourth section (124).

6. The extrusion device for processing plastic products according to claim 5, characterized in that: The thermal insulation sleeve (13) comprises a heating tube (1301) and a cooling tube (1302); the first thermal insulation zone (131) and the second thermal insulation zone (132) are each provided with an independent heating tube (1301); the third thermal insulation zone (133) and the fourth thermal insulation zone (134) are provided with heating tubes (1301) and cooling tubes (1302) in an axially alternating manner so as to maintain the third thermal insulation zone (133) and the fourth thermal insulation zone (134) at a set target temperature; and the axial length of the heating tube (1301) and the cooling tube (1302) in the fourth thermal insulation zone (134) is shorter than that in the third thermal insulation zone (133).

7. The extrusion device for processing plastic products according to claim 5, characterized in that: A screw groove (60) is provided on the outer wall of the screw (12), and the screw groove (60) includes a first screw groove (61), a second screw groove (62), a third screw groove (63) and a fourth screw groove (64). In the die head (10), the direction in which the mixing barrel (30) moves toward the die head (50) is set as a first direction, and the opposite direction is set as a second direction. The first screw groove (61) is configured to feed the granular raw material along the surface of the screw (12) in a spiral direction toward the first direction. The second screw groove (62) is configured to feed the granular raw material along the surface of the screw (12) in a spiral direction toward the second direction. The third screw groove (63) is configured to feed the granular raw material along the surface of the screw (12) in a spiral direction toward the first direction, and allows the granular raw material to penetrate the screw (12) in a radial direction. The fourth screw groove (64) is configured to feed the granular raw material along the surface of the screw (12) in a spiral direction toward the first direction.

8. The extrusion device for processing plastic products according to claim 7, characterized in that: The first screw groove (61) and the second screw groove (62) are both arranged on the outer walls of the first section (121), the second section (122) and the third section (123); the third screw groove (63) is arranged on the outer wall of the third section (123); and the fourth screw groove (64) is arranged on the outer wall of the fourth section (124); The ratio of the first screw groove (61) to the second screw groove (62) on the outer wall of the first section (121) is greater than the ratio of the first screw groove (61) to the second screw groove (62) on the outer wall of the second section (122), and the depth of the fourth screw groove (64) is less than the depth of the first screw groove (61).

9. The extrusion device for processing plastic products according to claim 7, characterized in that: The third screw groove (63) comprises a circumferential groove (630) and a radial groove (631); the radial groove (631) is spirally distributed along the surface of the screw (12); the radial groove (631) penetrates the screw (12) in the radial direction; a stopper (632) is provided on the radial groove (631) at a rear side corresponding to the circumferential groove (630) so that the material in the radial groove (631) can enter the circumferential groove (630).

10. The extrusion device for processing plastic products according to claim 7, characterized in that: A broken groove (620) is provided on the surface wall of the screw rod (12) and penetrates two adjacent second screw grooves (62) in the axial direction.

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