A screw extruder for processing plastic products

Abstract

The invention relates to the technical field of extrusion molding, and provides a screw extruder for processing plastic products, comprising an upper hopper, an extrusion sleeve, an extrusion screw, an extrusion box, a gas circulation system, a conical shell, a magnetic attraction component and a material guiding mechanism, wherein an exhaust port is arranged on the surface of the extrusion box, an annular scraper is arranged inside the conical shell, the magnetic attraction component comprises a flexible magnet belt and air holes, the flexible magnet belt moves upwardly at an angle, the surface of the flexible magnet belt is provided with air holes, the annular scraper is in sliding contact with the lower surface of the flexible magnet belt, a material guiding port is arranged in the upper hopper, the material guiding port is located above the flexible magnet belt, a perforated tube in the material guiding mechanism is fixedly connected between a rotating tube and a material guiding worm, a driving member is transmission-connected to the material guiding worm, a gas circulation system is connected between the exhaust port and the rotating tube, one end of a cleaning rod is fixedly connected to a mesh tube, and the other end of the cleaning rod is in sliding contact with the bottom of the conical shell, and the invention has the characteristics of automatically removing metal impurities and automatically drying plastic particles.

Description

Technical Field

[0001] The invention relates to the technical field of extrusion molding, in particular to a screw extruder for processing plastic products. Background Art

[0002] Patent No. CN115122606B discloses a screw extruder for plastic production, including a main body, a guide frame fixedly connected to the upper end of the front side of the main body, a lifting mechanism installed on the front side of the main body and the guide frame, a control mechanism installed on the front side of the lifting mechanism, a material discharge mechanism installed on the outside of the control mechanism, the lifting mechanism includes a fixed block fixedly connected to the front end of the upper side of the guide frame, a fixed box fixedly connected to the front end of the lower side of the main body, two groups of screw rods movably connected between the fixed block and the fixed box, the outer sides of the two groups of screw rods are movably connected to sleeve rod blocks, and the front ends of the two groups of sleeve rod blocks are fixedly connected to lifting plates. Through the mutual cooperation between the lifting mechanism, the control mechanism, and the material discharge mechanism, the design of the device can achieve the purpose of automatic loading and unloading, reduce labor and improve efficiency. Although the above technical solution can improve production efficiency, it still has the following defects in the feeding process: (1) When the plastic particles fed into the feed hopper contain metal particle impurities, the hard metal particles are prone to jamming or damaging the extrusion screw because the metal particles cannot reach a molten state at the temperature inside the extrusion sleeve; (2) When the plastic particles are stored for a long time, especially in humid environments such as rainy days, there will be moisture on the surface of the plastic particles. After the plastic particles are fed into the feed hopper, if the plastic particles are not fully dried, the moisture will cause problems such as pores and broken strips on the product surface in the subsequent extrusion process. Summary of the invention

[0003] The purpose of the present invention is to provide a screw extruder for processing plastic products, aiming to solve the problems existing when using an existing screw extruder for processing plastic products.

[0004] To achieve the above object, the present invention provides the following technical solution: a screw extruder for processing plastic products, comprising an upper hopper, an extrusion sleeve, an extrusion screw, an extrusion box and a gas circulation system, wherein the upper hopper is installed above the extrusion sleeve, the extrusion screw is installed in the extrusion sleeve, the extrusion box is connected to the extrusion sleeve, and an exhaust port is provided on the surface of the extrusion box, and further comprising:

[0005] A conical shell fixedly installed in the upper hopper, wherein an annular scraper is arranged inside the conical shell, and a slag discharge pipe is fixedly connected to the bottom of the conical shell;

[0006] A magnetic attraction component installed on the surface of a conical shell, the magnetic attraction component includes a flexible magnet belt, a vent hole, a rotating shaft, a driving motor and a bevel gear, the flexible magnet belt is installed between two of the rotating shafts, one of the rotating shafts is connected to the driving motor in a transmission manner, each of the rotating shafts is fixedly connected to a bevel gear, and a plurality of bevel gears are connected in a transmission manner, the inclined flexible magnet belt is parallel to the surface of the conical shell, the driving motor drives a plurality of flexible magnet belts to move upward in an inclined manner through the bevel gears, the surface of the flexible magnet belt is provided with a vent hole, and the annular scraper is in sliding contact with the lower surface of the flexible magnet belt;

[0007] A material guide port is provided in the upper hopper, and the material guide port is located above the flexible magnet belt;

[0008] A material guiding mechanism, the material guiding mechanism comprises a driving member, a material guiding worm, a rotating tube, a mesh tube and a cleaning rod, the driving member, the rotating tube and the mesh tube are all connected to the conical shell, the mesh tube is fixedly connected between the rotating tube and the material guiding worm, the driving member is transmission-connected to the material guiding worm, the gas circulation system is connected between the exhaust port and the rotating tube, one end of the cleaning rod is fixedly connected to the mesh tube, and the other end of the cleaning rod is in sliding contact with the bottom of the conical shell.

[0009] As a further solution of the present invention, the material guiding mechanism also includes a curved groove, a bracket, a sealing plate, a movable rod and a ball head. The bracket is fixedly connected to the sealing plate, the movable rod is fixedly connected between the bracket and the ball head, the movable rod passes through the surface of the conical shell, the surface of the rotating tube is provided with a curved groove, the ball head is slidably connected in the curved groove, and the sealing plate is slidably connected in the material guiding port.

[0010] As a further solution of the present invention, a mounting hole is provided on the surface of the conical shell, side plates are fixedly connected on both sides of the mounting hole, the magnetic suction component is installed in the mounting hole, an annular baffle is fixedly connected to the bottom of the conical shell, and the cleaning rod is distributed between the annular scraper and the annular baffle.

[0011] As a further solution of the present invention, the magnetic attraction assembly also includes a worm wheel and a worm, the drive motor is fixedly connected to the conical shell, the worm is connected to the drive motor, one of the rotating shaft surfaces is fixedly connected to a worm wheel, and the worm is transmission-connected to the worm wheel.

[0012] As a further solution of the present invention, a material discharge pipe and a fixed seat are fixedly connected to the bottom of the upper hopper, the extrusion sleeve is fixedly connected to the material discharge pipe, the material guide worm is distributed in the material discharge pipe, the bottom of the conical shell is fixedly connected to the fixed seat, a material guide plate is fixedly connected to the inner wall of the upper hopper, a fixed cover is fixedly connected to the surface of the material guide plate, and the material guide port is located on the surface of the fixed cover.

[0013] As a further solution of the present invention, the material guide plate is inclined toward a direction close to the material guide port, and the surface of the conical shell is inclined toward a direction away from the material guide port.

[0014] As a further solution of the present invention, the gas circulation system includes an air intake pipe, a processing box, an air pump and an exhaust pipe, the processing box and the air pump are fixedly connected to the extrusion sleeve, the air intake pipe is connected between the exhaust port and the processing box, the processing box is connected to the air pump, one end of the exhaust pipe is fixedly connected to the air pump, and the end of the rotating pipe is movably connected to the other end of the exhaust pipe. The beneficial effects of the present invention are: the design of the combination of the conical shell, the magnetic suction component, the material guide mechanism and the gas circulation system can not only automatically and efficiently remove the metal impurities in the plastic particles by using the flexible magnet belt that moves upward in an inclined manner, but also can clean up the metal impurities adsorbed on the surface of the flexible magnet belt by using the power of the material guide worm when feeding the material, the gas circulation system will dry the hot air discharged from the extrusion box through the rotating tube and the mesh tube and then input it into the conical shell and the upper hopper, and the rising hot air can be used to pass through the air holes on the surface of the flexible magnet belt to dry the plastic particles, and the present application solves the problem of stuck material and the appearance of pores in the product at the same time, which not only improves the stability of the screw extruder when working, but also improves the product molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a three-dimensional diagram of a screw extruder for processing plastic products according to an embodiment of the present invention.

[0016] Figure 2 It is a cross-sectional view of the upper hopper according to an embodiment of the present invention.

[0017] Figure 3 It is a stereoscopic view of a conical shell according to an embodiment of the present invention.

[0018] Figure 4 It is a cross-sectional view of a conical shell according to an embodiment of the present invention.

[0019] Figure 5 It is a plan cross-sectional view of the upper hopper and the conical shell according to an embodiment of the present invention.

[0020] Figure 6 It is a three-dimensional diagram of a magnetic attraction component according to an embodiment of the present invention.

[0021] Figure 7 It is a three-dimensional diagram of the material guiding mechanism according to an embodiment of the present invention.

[0022] Figure 8 It is an assembly diagram of the conical shell, magnetic attraction component and material guiding mechanism according to an embodiment of the present invention.

[0023] Fig. 9 For the present invention Figure 8 A partial enlarged view of point a in the middle.

[0024] Fig.10 It is a planar cross-sectional view of the upper hopper, conical shell, magnetic attraction assembly and material guiding mechanism according to an embodiment of the present invention.

[0025] Fig.11 For the present invention Fig.10 A partial enlarged view of point b in the middle.

[0026] Fig.12 For the present invention Fig.10 A partial enlarged view of point c in the middle.

[0027] Fig.13 For the present invention Figure 1 A cross-sectional view of a screw extruder for processing plastic products.

[0028] Fig.14 This is a cross-sectional view of the upper hopper, conical shell, magnetic suction component, material guide mechanism and exhaust pipe of an embodiment of the present invention. Figure numerals: 1-upper hopper, 11-fixed seat, 12-discharge pipe, 13-material guide plate, 14-fixed cover, 15-material guide port, 2-extrusion sleeve, 3-extrusion screw, 4-conical shell, 41-mounting hole, 42-side plate, 43-annular scraper, 44-annular baffle, 45-slag discharge pipe, 5-magnetic suction component, 51-flexible magnet belt, 511-air vent, 52-rotating shaft, 53-drive motor, 54-worm gear, 55-worm, 56-bevel gear, 6-material guiding mechanism, 61-driving member, 62-material guiding worm, 63-rotating tube, 631-curved groove, 64-mesh tube, 65-bracket, 66-sealing plate, 67-cleaning rod, 68-transmission gear, 69-movable rod, 691-ball head, 7-extrusion box, 71-exhaust port, 8-gas circulation system, 81-intake pipe, 82-processing box, 83-air pump, 84-exhaust pipe. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0031] See also Figures 1 to 14 In one embodiment of the present invention, a screw extruder for processing plastic products includes an upper hopper 1, an extrusion sleeve 2, an extrusion screw 3, an extrusion box 7 and a gas circulation system 8, wherein the upper hopper 1 is installed above the extrusion sleeve 2, the extrusion screw 3 is installed in the extrusion sleeve 2, the extrusion box 7 is connected to the extrusion sleeve 2, and an exhaust port 71 is provided on the surface of the extrusion box 7, and further includes:

[0032] A conical shell 4 is fixedly installed in the upper hopper 1, wherein an annular scraper 43 is arranged inside the conical shell 4, and a slag discharge pipe 45 is fixedly connected to the bottom of the conical shell 4;

[0033] A magnetic attraction component 5 installed on the surface of the conical shell 4, the magnetic attraction component 5 includes a flexible magnet belt 51, a vent hole 511, a rotating shaft 52, a driving motor 53 and a bevel gear 56, the flexible magnet belt 51 is installed between two of the rotating shafts 52, one of the rotating shafts 52 is connected to the driving motor 53 in a transmission manner, each of the rotating shafts 52 is fixedly connected to a bevel gear 56, and a plurality of bevel gears 56 are connected in a transmission manner, the inclined flexible magnet belt 51 is parallel to the surface of the conical shell 4, the driving motor 53 drives a plurality of flexible magnet belts 51 to move upward in an inclined manner through the bevel gear 56, the surface of the flexible magnet belt 51 is provided with a vent hole 511, and the annular scraper 43 is in sliding contact with the lower surface of the flexible magnet belt 51;

[0034] The upper hopper 1 is provided with a material guide port 15, and the material guide port 15 is located above the flexible magnet belt 51;

[0035] The material guiding mechanism 6 comprises a driving member 61, a material guiding worm 62, a rotating tube 63, a mesh tube 64 and a cleaning rod 67. The driving member 61, the rotating tube 63 and the mesh tube 64 are all connected to the conical shell 4. The mesh tube 64 is fixedly connected between the rotating tube 63 and the material guiding worm 62. The driving member 61 is transmission-connected to the material guiding worm 62. The gas circulation system 8 is connected between the exhaust port 71 and the rotating tube 63. One end of the cleaning rod 67 is fixedly connected to the mesh tube 64, and the other end of the cleaning rod 67 is in sliding contact with the bottom of the conical shell 4.

[0036] See also Figure 6 and Figure 8 Furthermore, the magnetic attraction component 5 also includes a worm gear 54 and a worm 55. The drive motor 53 is fixedly connected to the conical shell 4, and the worm 55 is connected to the drive motor 53. A worm gear 54 is fixedly connected to the surface of one of the rotating shafts 52, and the worm 55 is transmission-connected to the worm gear 54.

[0037] See also Figure 3 , Figure 4 and Fig.12 Furthermore, a mounting hole 41 is provided on the surface of the conical shell 4, and side plates 42 are fixedly connected on both sides of the mounting hole 41. The magnetic attraction component 5 is installed in the mounting hole 41, and an annular baffle 44 is fixedly connected to the bottom of the conical shell 4. The cleaning rod 67 is distributed between the annular scraper 43 and the annular baffle 44. The annular baffle 44 can prevent plastic particles from falling from both sides of the flexible magnet belt 51. The specific model and size of the flexible magnet belt 51 are not limited.

[0038] See also Figure 2 and Fig.13 Furthermore, a feed pipe 12 and a fixed seat 11 are fixedly connected to the bottom of the upper hopper 1, the extrusion sleeve 2 is fixedly connected to the feed pipe 12, the guide worm 62 is distributed in the feed pipe 12, and the bottom of the conical shell 4 is fixedly connected to the fixed seat 11.

[0039] In the embodiment of the present invention, a transmission gear 68 is fixedly connected to the surface of the material guiding worm 62 , and the driving member 61 is in transmission connection with the transmission gear 68 .

[0040] See also Figure 7 , Fig. 9 , Fig.11 and Fig.12 In one embodiment of the present invention, the material guiding mechanism 6 further comprises a curved groove 631, a bracket 65, a sealing plate 66, a movable rod 69 and a ball head 691, the bracket 65 is fixedly connected to the sealing plate 66, the movable rod 69 is fixedly connected between the bracket 65 and the ball head 691, the movable rod 69 penetrates the surface of the conical shell 4, the surface of the rotating tube 63 is provided with a curved groove 631, the ball head 691 is slidably connected in the curved groove 631, and the sealing plate 66 is slidably connected in the material guiding port 15.

[0041] See also Figure 2 , Fig.11 and Fig.12 Furthermore, a material guide plate 13 is fixedly connected to the inner wall of the upper hopper 1, a fixed cover 14 is fixedly connected to the surface of the material guide plate 13, the material guide port 15 is located on the surface of the fixed cover 14, the material guide plate 13 is inclined toward the direction close to the material guide port 15, and the surface of the conical shell 4 is inclined toward the direction away from the material guide port 15.

[0042] In the embodiment of the present invention, due to the limiting effect of the conical shell 4 on the movable rod 69, when the rotating tube 63 rotates, the curved groove 631 that rotates with the rotating tube 63 achieves the purpose of driving the movable rod 69, the bracket 65 and the sealing plate 66 to perform lifting movements by means of a sliding connection with the ball head 691. After the plastic particles are transported into the upper hopper 1 manually or by a feeding machine, when the material guide port 15 is in an open state, the plastic particles will enter the material guide port 15 along the material guide plate 13 under the action of gravity.

[0043] See also Figure 1 and Fig.14In one embodiment of the present invention, the gas circulation system 8 includes an intake pipe 81, a processing box 82, an air pump 83 and an exhaust pipe 84. The processing box 82 and the air pump 83 are both fixedly connected to the extrusion sleeve 2. The intake pipe 81 is connected between the exhaust port 71 and the processing box 82. The processing box 82 and the air pump 83 are communicated. One end of the exhaust pipe 84 is fixedly connected to the air pump 83, and the end of the rotating tube 63 is movably connected to the other end of the exhaust pipe 84.

[0044] In the embodiment of the present invention, the processing box 82 includes a purification layer and a drying layer inside. The purification layer is used to remove harmful substances in the air, and the drying layer is used to remove moisture in the air. The exhaust pipe 84 runs through the surface of the bracket 65.

[0045] Working principle: After the plastic particles are transported into the upper hopper 1 manually or by a feeding machine, the driving motor 53 and the driving member 61 are started at the same time. The driving motor 53 drives one of the rotating shafts 52 to rotate through the worm 55 and the worm gear 54. The rotating rotating shaft 52 drives the flexible magnet belt 51 to move obliquely upward between the side plates 42. The rotating shaft 52 drives the remaining rotating shafts 52 to rotate in the same direction through the bevel gear 56, thereby driving the remaining flexible magnet belts 51 to move obliquely upward together. The driving member 61 drives the guide worm 62 and the mesh through the transmission gear 68. The hole tube 64 and the rotating tube 63 rotate coaxially, and the rotating rotating tube 63 is slidably connected with the ball head 691 through the curved groove 631 to drive the movable rod 69, the bracket 65 and the sealing plate 66 to make reciprocating linear motion. When the sealing plate 66 moves upward, the plastic particles in the upper hopper 1 fall to the surface of the flexible magnet belt 51 through the opened guide port 15. When the sealing plate 66 moves downward, the guide port 15 can be sealed. The reciprocating linear motion of the sealing plate 66 can control the discharge frequency of the plastic particles, thereby achieving the purpose of controlling the discharge amount of the plastic particles;

[0046] Compared with the stationary flexible magnet belt 51, the contact distance or contact area between the flexible magnet belt 51 moving obliquely upward and the plastic particles is larger, so that the flexible magnet belt 51 can fully contact the metal impurities in the plastic particles, and then can absorb the metal impurities in the plastic particles to the maximum extent. When the flexible magnet belt 51 with adsorbed metal impurities passes through the annular scraper 43, the annular scraper 43 can clean the metal impurities on the surface of the flexible magnet belt 51, and the cleaned metal impurities are distributed between the annular scraper 43 and the annular baffle 44. The cleaning rod 67 rotating with the mesh tube 64 can gather the metal impurities scattered between the annular scraper 43 and the annular baffle 44 into the slag discharge pipe 45 to prevent the metal impurities from falling into the discharge pipe 12 and the extrusion sleeve 2, thereby preventing the problem of material jamming or damage to the extrusion screw 3.

[0047] Since the temperature inside the extrusion sleeve 2 and the extrusion box 7 is relatively high, in order to facilitate the discharge of air in the molten plastic particles and improve the molding of the plastic product, an exhaust port 71 is provided on the surface of the extrusion box 7. The high-temperature gas discharged from the exhaust port 71 enters the processing box 82 for purification and drying. The air pump 83 discharges the dried high-temperature gas into the rotating tube 63 and the mesh tube 64 through the exhaust pipe 84, and finally enters the conical shell 4 and the upper hopper 1 through the mesh tube 64. In the process of the hot air rising through the air holes 511 on the surface of the flexible magnet belt 1, the plastic particles on the surface of the flexible magnet belt 51 can be dried. The dried hot air is discharged outward through the intermittently opened guide port 15. The dried plastic particles and the removal of metal impurities enter the discharge pipe 12 under gravity. The guide worm 62 transports the plastic particles to the extrusion sleeve 2 for melting and extrusion molding, which solves the problem of pores in the extruded product caused by moisture when the plastic particles are stored for a long time.

[0048] In summary, the design of the combination of the conical shell 4, the magnetic suction component 5, the material guide mechanism 6 and the gas circulation system 8 can, on the one hand, utilize the flexible magnet belt 51 that moves upward obliquely to automatically and efficiently remove the metal impurities in the plastic particles. On the other hand, with the help of the power of the material guide worm 62 during material feeding, not only can the metal impurities adsorbed on the surface of the flexible magnet belt 51 be cleaned up, but also the purpose of intermittent material discharge can be achieved by controlling the lifting of the sealing plate 66. The sealing plate 66 that moves up and down can also prevent the plastic particles from bridging when discharging. In addition, the gas circulation system 8 can squeeze the extruder box The hot air discharged from 7 is input into the conical shell 4 and the upper hopper 1 through the rotating tube 63 and the mesh tube 64 after being dried. The rising hot air can dry the plastic particles on the surface of the flexible magnet belt 51 through the air holes 511 on the surface of the flexible magnet belt 51, and at the same time solves the problem of hard metal impurities getting stuck in the extrusion sleeve 2 and the problem of air holes in the extruded product caused by moisture when the plastic particles are stored for a long time. It has the characteristics of automatically removing metal impurities, automatically drying plastic particles and automatically controlling the feeding speed, which not only improves the stability of the screw extruder during operation, but also improves the product molding quality.

[0049] For those skilled in the art, although several embodiments and examples of the present invention are described, these embodiments and examples are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the main purpose of the invention. These embodiments and their variations are included in the scope and main purpose of the invention, and are included in the invention described in the claims and their equivalents. In addition, it should be understood that although this specification is described in accordance with the embodiments, not every embodiment includes only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A screw extruder for processing plastic products, comprising an upper hopper (1), an extrusion sleeve (2), an extrusion screw (3), an extrusion box (7) and a gas circulation system (8), wherein the upper hopper (1) is installed above the extrusion sleeve (2), the extrusion screw (3) is installed in the extrusion sleeve (2), the extrusion box (7) is connected to the extrusion sleeve (2), and an exhaust port (71) is provided on the surface of the extrusion box (7), characterized in that: Also includes: A conical shell (4) fixedly mounted in the upper hopper (1), wherein an annular scraper (43) is arranged inside the conical shell (4), and a slag discharge pipe (45) is fixedly connected to the bottom of the conical shell (4); A magnetic attraction component (5) is installed on the surface of a conical shell (4), the magnetic attraction component (5) comprising a flexible magnet belt (51), a vent hole (511), a rotating shaft (52), a driving motor (53) and a bevel gear (56), the flexible magnet belt (51) is installed between two rotating shafts (52), one of the rotating shafts (52) is transmission-connected to the driving motor (53), each rotating shaft (52) is fixedly connected to a bevel gear (56), a plurality of bevel gears (56) are transmission-connected to each other, the inclined flexible magnet belt (51) is parallel to the surface of the conical shell (4), the driving motor (53) drives a plurality of flexible magnet belts (51) to move obliquely upwards through the bevel gear (56), the surface of the flexible magnet belt (51) is provided with a vent hole (511), and the annular scraper (43) is in sliding contact with the lower surface of the flexible magnet belt (51); The upper hopper (1) is provided with a material guide port (15), and the material guide port (15) is located above the flexible magnet belt (51); A material guiding mechanism (6), the material guiding mechanism (6) comprising a driving member (61), a material guiding worm (62), a rotating tube (63), a mesh tube (64) and a cleaning rod (67), the driving member (61), the rotating tube (63) and the mesh tube (64) are all connected to the conical shell (4), the mesh tube (64) is fixedly connected between the rotating tube (63) and the material guiding worm (62), the driving member (61) is transmission-connected to the material guiding worm (62), the gas circulation system (8) is connected between the exhaust port (71) and the rotating tube (63), one end of the cleaning rod (67) is fixedly connected to the mesh tube (64), and the other end of the cleaning rod (67) is in sliding contact with the bottom of the conical shell (4); The material guiding mechanism (6) further comprises a curved groove (631), a bracket (65), a sealing plate (66), a movable rod (69) and a ball head (691); the bracket (65) is fixedly connected to the sealing plate (66); the movable rod (69) is fixedly connected between the bracket (65) and the ball head (691); the movable rod (69) penetrates the surface of the conical shell (4); the surface of the rotating tube (63) is provided with a curved groove (631); the ball head (691) is slidably connected in the curved groove (631); and the sealing plate (66) is slidably connected in the material guiding port (15); The surface of the conical shell (4) is provided with a mounting hole (41), and side plates (42) are fixedly connected to both sides of the mounting hole (41). The magnetic attraction component (5) is installed in the mounting hole (41), and the bottom of the conical shell (4) is fixedly connected to an annular baffle (44), and the cleaning rod (67) is distributed between the annular scraper (43) and the annular baffle (44); The magnetic attraction assembly (5) further comprises a worm wheel (54) and a worm (55); the drive motor (53) is fixedly connected to the conical housing (4); the worm (55) is connected to the drive motor (53); a worm wheel (54) is fixedly connected to the surface of one of the rotating shafts (52); and the worm (55) is drivingly connected to the worm wheel (54). The bottom of the upper hopper (1) is fixedly connected to a feed tube (12) and a fixed seat (11); the extrusion sleeve (2) is fixedly connected to the feed tube (12); the guide worm (62) is distributed in the feed tube (12); the bottom of the conical shell (4) is fixedly connected to the fixed seat (11); the inner wall of the upper hopper (1) is fixedly connected to a guide plate (13); the surface of the guide plate (13) is fixedly connected to a fixed cover (14); and the guide port (15) is located on the surface of the fixed cover (14); The material guide plate (13) is inclined in a direction approaching the material guide port (15), and the surface of the conical shell (4) is inclined in a direction away from the material guide port (15).

2. A screw extruder for processing plastic products according to claim 1, characterized in that: The gas circulation system (8) comprises an air intake pipe (81), a processing box (82), an air pump (83) and an exhaust pipe (84); the processing box (82) and the air pump (83) are both fixedly connected to the extrusion sleeve (2); the air intake pipe (81) is connected between the exhaust port (71) and the processing box (82); the processing box (82) and the air pump (83) are in communication; one end of the exhaust pipe (84) is fixedly connected to the air pump (83); and the end of the rotating tube (63) is movably connected to the other end of the exhaust pipe (84).

Images