A screw extruder

Abstract

The embodiment of the application provides a screw extruder, and relates to the technical field of extruders. The screw extruder comprises a machine body, a material hopper is communicated with a feeding opening of the machine body, a blocking cover plate is clamped on the material hopper, a feeding window plate is hinged on both sides of the blocking cover plate through hinges, a discharging window is left, a double-roller feeding mechanism is communicated with a discharging opening of the machine body close to the material hopper, and the double-roller feeding mechanism is driven by a servo motor to drive the double-roller transmission to extrude and discharge the material; a double-screw extrusion mechanism is communicated with the discharging opening of the machine body close to the double-roller feeding mechanism, the double-screw extrusion mechanism is driven by a servo motor to drive two screw extrusion frames to synchronously perform double-channel high-efficiency extrusion work, and a material receiving conveyor is fixed to the outside of the machine body. Based on the conditions of disturbance cloth heat and cooling solidification, three kinds of shape molds are used to realize rapid disassembly, switching and multiple high-efficiency extrusion molding effects of the material.

Description

Technical Field

[0001] This invention belongs to the field of extruder technology, and particularly relates to a screw extruder. Background Technology

[0002] An extruder relies on the pressure and shear force generated by the rotation of the screw to fully plasticize and uniformly mix materials, which are then shaped through a die. Extruders can be broadly classified into: twin-screw extruders, single-screw extruders, less common multi-screw extruders, and screwless extruders, with twin-screw extruders being the most frequently used.

[0003] In the prior art (patent application CN103282183B, entitled "Screw Shaft Structure of a Twin-Screw Extruder"), compared with the existing shoulder portion, the outer diameter is smaller, which can reduce the outer diameter of the screw shaft blank, reduce the weight of the screw shaft blank, and reduce the shape, thereby achieving a reduction in blank cost and a reduction in processing costs due to the shortened processing time. In the process of implementing this technical solution, at least the following problems were found in the prior art: During the extrusion molding of materials using a twin-screw extruder, traditional twin-screw extruders can only extrude one molding shape according to the shape requirements of the material product. If it is necessary to extrude another shape, it is necessary to purchase equipment, which increases the cost of extrusion equipment, raises the unit price of the product, reduces the product's competitiveness, and directly affects its economic benefits. Summary of the Invention

[0004] This application aims to at least solve the technical problem in the prior art of achieving diverse and efficient extrusion molding effects on materials by using a method of rapid assembly and disassembly switching between three mold shapes under conditions of turbulent heat distribution and cooling solidification. To this end, this application proposes a screw extruder.

[0005] To achieve the above objectives, the specific technical solution of the present invention is as follows: A screw extruder includes a main body, the feed port of the main body is connected to a material hopper, and a sealing cover is snapped onto the material hopper. Feed windows are hinged to both sides of the sealing cover and a discharge window is provided. The discharge port of the main body near the material hopper is connected to a double roller feeding mechanism, and the material is extruded and discharged by a double roller drive driven by a servo motor. Additionally, a double-spiral extrusion mechanism is connected to the discharge port of the main body of the machine near the double-roller feeding mechanism. A servo motor-driven synchronous wheel set drives two spiral extrusion frames to perform synchronous dual-channel high-efficiency extrusion operations. A receiving conveyor is fixed on the outside of the main body of the machine. A tension roller set driven by a servo motor drives the conveyor belt to perform linear conveying operations. A cutting mechanism is set in the middle section of the receiving conveyor. A servo motor-driven rotating blade holder performs equidistant cutting operations. Furthermore, side supports are longitudinally arranged on both sides of the main body of the machine, and top insertion components are installed on the two sets of side supports. A switching component that matches the top insertion component is installed on the outside of the double helix extrusion mechanism, and a heat distribution component that matches the double roller feeding mechanism is installed in the material hopper.

[0006] Preferably, the top insertion assembly includes lifting cylinders longitudinally arranged on two sets of side supports, and lifting seats are fixed on the piston rods of the two sets of lifting cylinders, and lifting heads are longitudinally arranged on the two sets of lifting seats.

[0007] Preferably, mounting ears are provided on both other sides of the main body, and a through tube is placed longitudinally on the outside of the mounting ears, and through slots are opened in the two sets of through tubes to connect with the lifting head. The lifting head and the through slots are both hexagonal prisms with an arc chamfer design.

[0008] Preferably, the two sets of side supports have vertical grooves on their outer sides, and sliders fixed to the lifting seats slide in the two sets of vertical grooves, and lifting lugs are fixed on the outer side of the mounting lugs.

[0009] Preferably, the switching assembly includes a circuit breaker fixed to the side plate of the main body, an electromagnet fixed to the frame of the main body, and a fixed magnet that is electromagnetically attracted to the electromagnet on the inner side of the mounting ear.

[0010] Preferably, the inner sides of the two sets of mounting ears are respectively fixed with a twisted extrusion die, a three-ring extrusion die, and a chopstick-shaped extrusion die, and are connected to the extrusion port of the double helix extrusion mechanism.

[0011] Preferably, a rotating mechanism is connected between the twisted extrusion die and the double-helix extrusion mechanism. This mechanism is driven by a servo motor and synchronously controls the rotation speed of the thirteen sets of discharge nozzles on the twisted extrusion die. A cutting mechanism is also connected between the three-ring extrusion die and the double-helix extrusion mechanism. This mechanism uses a servo motor to drive the swing arm and connecting rod to drive the cutting blade. The three-ring material extruded from the array of discharge holes on the three-ring extrusion die is cut into sheet-like products using adaptive speed adjustment. Additionally, columnar discharge holes are staggered on the chopstick-shaped extrusion die.

[0012] Preferably, the heating assembly includes a heating and cooling unit located below the receiving conveyor, with a heat supply pipe connected to the heat inlet of the heating and cooling unit, and a rotating end connected to the end of the heat supply pipe.

[0013] Preferably, the rotating end has a connecting pipe that rotates inside and is in communication with each other, and the bottom end of the connecting pipe passes through the sealing cover plate and is connected to a heat-distributing head, and a heat-conducting rod is connected around the heat-distributing head.

[0014] Preferably, a stepper motor is fixed to the outer side of the sealing cover plate, and a drive gear is sleeved on the output shaft of the stepper motor. A driven gear meshes with the outer side of the drive gear. The driven gear is sleeved on the connecting pipe, and a turbulence impeller for turbulent material discharge from the material hopper is connected between the connecting pipe and the heating head.

[0015] The screw extruder of the present invention has the following advantages: 1. This spiral extruder, through a top insertion assembly and a switching assembly, allows for quick switching between twisted extrusion dies, three-ring extrusion dies, and chopstick-shaped extrusion dies according to product shape requirements using a quick disassembly and assembly method. It is flexible and convenient, eliminating the need to purchase additional molding equipment, reducing equipment procurement costs, spreading the product unit price, making it more competitive in the market, and improving its economic benefits.

[0016] 2. This type of screw extruder uses a heating assembly to uniformly heat and turbulently pressurize the material injected into the hopper, preventing the material from solidifying due to changes in external temperature. This keeps the material fluid, facilitating smooth extrusion of the twin-screw extrusion mechanism and improving the molding quality of subsequent products. It also applies downward pressure to the material to prevent blockage and stagnation, resulting in high feeding efficiency.

[0017] 3. This spiral extruder, through a shaping component, achieves a cooling and solidification effect on three different shaped products extruded, enabling them to quickly solidify at low temperatures. This also prevents the formed products from collapsing or tilting due to changes in external temperature, ensuring the integrity and shape of the products, improving the extrusion yield, reducing material waste, and lowering costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a diagram illustrating the twisted extrusion molding process of a screw extruder structure according to the present invention; Figure 2 This is a diagram of a three-ring extrusion molding process for a screw extruder according to the present invention; Figure 3 This is a diagram illustrating the chopstick-shaped extrusion molding process of a screw extruder structure according to the present invention. Figure 4 This is a partially exploded view of the structure of a screw extruder according to the present invention; Figure 5This is a diagram showing the switching states of the twisted extrusion die structure of the present invention; Figure 6 This is a diagram showing the switching states of the three-ring extrusion die structure of the present invention; Figure 7 This is a diagram showing the switching states of the chopstick-shaped extrusion die structure of the present invention; Figure 8 This is a partial anatomical view of the top insertion assembly and switching assembly structure of the present invention; Figure 9 This is a bottom view of the structure of the heat distribution assembly and shaping assembly of the present invention; Figure 10 This is a rear view of the heat distribution assembly structure of the present invention; Figure 11 This is a partial exploded view of the structure of the heat distribution assembly, stepper motor, drive gear, driven gear, and turbulence impeller of the present invention. Figure 12 This is a schematic diagram of the standardized component structure of the present invention; Figure 13 This is a bottom view of the cooling rack structure of the present invention.

[0020] Explanation of markings in the diagram: 1. Main body of the machine; 2. Material hopper; 3. Sealing cover plate; 4. Double roller feeding mechanism; 5. Double spiral extrusion mechanism; 6. Receiving conveyor; 7. Cutting mechanism; 8. Side support; 91. Lifting cylinder; 92. Lifting seat; 93. Lifting head; 94. Mounting ear; 95. Inserting cylinder; 96. Inserting slot; 101. Circuit breaker; 102. Electromagnet; 103. Fixed magnet; 104. Twisted extrusion die; 105. Three-ring extrusion die; 106. Chopstick-shaped extrusion die; 111. Cooling... Integrated heating and cooling machine; 112. Heat supply pipe; 113. Rotating end; 114. Connecting pipe; 115. Heat distribution head; 116. Heat conduction rod; 121. T-connector; 122. Cold supply pipe; 123. Pressure booster valve; 124. Cold distribution frame; 125. Direct spray nozzle; 126. Angled spray nozzle; 13. Vertical groove; 14. Slider; 15. Lifting lug; 16. Rotating mechanism; 17. Cutting mechanism; 18. Stepper motor; 19. Drive gear; 20. Driven gear; 21. Turbine impeller; 22. Temperature sensor; 23. Feeding window. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: like Figures 1-13As shown, a screw extruder of the present invention includes a main body 1, a material hopper 2 connected to the feed port of the main body 1, and a sealing cover plate 3 clamped on the material hopper 2. Feed window plates 23 are hinged to both sides of the sealing cover plate 3, and a discharge window is provided to facilitate opening the two sets of feed window plates 23 to expose the discharge window. After the discharge window is exposed, material is added into the material hopper 2 through the sealing cover plate 3. The main body 1 is connected to a double roller feeding mechanism 4 near the discharge port of the material hopper 2. The double roller transmission driven by a servo motor is used to extrude the material and apply extrusion force to force the material to discharge quickly to prevent the material from sticking to the wall and stagnating. Furthermore, the main body 1 is connected to the double-screw extrusion mechanism 5 near the discharge port of the double-roller feeding mechanism 4. The synchronous wheel set driven by the servo motor drives the two spiral extrusion frames to perform synchronous dual-channel high-efficiency extrusion operation, which efficiently extrudes and shapes the material. The receiving conveyor 6 is fixed on the outside of the main body 1. The tension roller set driven by the servo motor drives the conveyor belt to perform linear conveying operation, which facilitates the rapid delivery of the extruded material product. A cutting mechanism 7 is set in the middle section of the receiving conveyor 6. The rotating blade holder driven by the servo motor performs equidistant cutting operation, which achieves equidistant and equal-length reciprocating cutting effect for the material product to be cut, which is convenient and fast.

[0022] like Figures 1-13 As shown, there are side supports 8 arranged longitudinally on both sides of the main body 1, and top insertion assemblies are provided on the two sets of side supports 8. The top insertion assembly includes lifting cylinders 91 arranged longitudinally on the two sets of side supports 8, lifting seats 92 are fixed on the piston rods of the two sets of lifting cylinders 91, and lifting heads 93 are arranged longitudinally on the two sets of lifting seats 92. The two lifting cylinders 91 are opened synchronously and drive the two sets of lifting seats 92 to move upward. Then, the two sets of lifting seats 92 drive the two lifting heads 93 to move upward. Mounting ears 94 are provided on both other sides of the main body 1. Insertion tubes 95 are longitudinally placed on the outside of the mounting ears 94. Insertion slots 96 are opened in the two sets of insertion tubes 95 to connect with the lifting heads 93. The two sets of lifting seats 92 drive the two lifting heads 93 to insert into the insertion slots 96 of the insertion tubes 95 on the mounting ears 94, and perform longitudinal insertion and positioning of the mounting ears 94. The lifting heads 93 and the insertion slots 96 are both hexagonal prisms with rounded chamfers to ensure that the lifting heads 93 and the insertion slots 96 are tightly connected to prevent gaps in the connection and wobbling or tilting. Vertical grooves 13 are provided on the outer sides of the two sets of side supports 8, and sliders 14 fixed to the lifting seat 92 slide in the two sets of vertical grooves 13. These sliders limit the movement of the lifting seat 92, improve its lifting stability, and effectively support the lifting seat 92 to prevent swaying and tilting. Additionally, lifting lugs 15 are fixed on the outer side of the mounting ear 94, and the mounting ear 94 is lifted and moved by the electric hoist through the two sets of lifting lugs 15.

[0023] The outer side of the twin-helix extrusion mechanism 5 is provided with a switching assembly that is matched with the top insertion assembly. The switching assembly includes a circuit breaker 101 fixed on the side plate of the main body 1, an electromagnet 102 fixed on the frame of the main body 1, and a fixed magnet 103 that is electromagnetically attracted to the electromagnet 102 fixed on the inner side of the mounting ear 94. When the circuit breaker 101 is controlled to energize the electromagnet 102, the energized electromagnet 102 will perform lateral electromagnetic attraction on the fixed magnet 103 on the mounting ear 94, thus completing the lateral positioning of the mounting ear 94. The inner sides of the two sets of mounting ears 94 are respectively fixed with a twisted extrusion die 104, a three-ring extrusion die 105 and a chopstick-shaped extrusion die 106, and are connected to the extrusion port of the double helix extrusion mechanism 5. According to the product shape requirements, combined with the transverse electromagnetic adsorption and longitudinal insertion positioning method, the required twisted extrusion die 104, three-ring extrusion die 105 or chopstick-shaped extrusion die 106 can be quickly switched. It is flexible and fast, and there is no need to purchase additional extrusion equipment. A rotating mechanism 16 is connected between the twisted extrusion die 104 and the double helix extrusion mechanism 5. The rotating mechanism is driven by a servo motor and synchronously controls the rotation speed of the thirteen sets of discharge nozzles on the twisted extrusion die 104, which is conducive to the material being extruded into a twisted shape. A cutting mechanism 17 is connected between the three-ring extrusion die 105 and the double helix extrusion mechanism 5. The cutting mechanism is driven by a servo motor to drive the swing arm and connecting rod to drive the cutting blade. The cutting mechanism adaptively adjusts the speed of the three-ring material extruded from the array of discharge holes on the three-ring extrusion die 105 into sheet products. The chopstick-shaped extrusion die 106 has staggered columnar discharge holes, which is conducive to the material being extruded and pulled into a chopstick shape. Furthermore, the material hopper 2 is equipped with a heat distribution assembly that is matched with the double roller feeding mechanism 4. The heat distribution assembly includes a cooling and heating integrated machine 111 located below the receiving conveyor 6, and a heat supply pipe 112 is connected to the heat supply port of the cooling and heating integrated machine 111, and a rotating end 113 is connected to the end of the heat supply pipe 112. The cooling and heating integrated machine 111 generates a heat source supply in advance, and the heat supply pipe 112 passes through the rotating end 113 and the connecting pipe 114 in sequence. A connecting pipe 114 rotates inside the rotating end 113 and remains in communication with each other. The bottom end of the connecting pipe 114 passes through the sealing cover plate 3 and is connected to the heating head 115. A heat-conducting rod 116 is connected around the circumference of the heating head 115. The pressurized heat source then reaches the two rows of heat-conducting rods 116 on the heating head 115. Under the action of heat conduction, the two rows of heat-conducting rods 116 uniformly heat the material in the material hopper 2 to prevent the material from being affected by changes in external temperature and from solidifying and stagnating. A stepper motor 18 is fixed on the outside of the sealing cover plate 3, and a drive gear 19 is sleeved on the output shaft of the stepper motor 18. A driven gear 20 meshes on the outside of the drive gear 19. The driven gear 20 is sleeved on the connecting pipe 114. The stepper motor 18 is turned on and the driven gear 20 is rotated by the drive gear 19. Furthermore, a turbulence impeller 21 for turbulent feeding of material hopper 2 is connected between the connecting pipe 114 and the heating head 115. While the driven gear 20 drives the connecting pipe 114 to rotate in the rotating end 113, the connecting pipe 114 also drives the turbulence impeller 21 and the two rows of heat-conducting rods 116 on the heating head 115 to rotate synchronously, thereby turbulenting the material in the material hopper 2 and applying downward extrusion force, so that the material reaches the double roller feeding mechanism 4. At the same time, the material in the material hopper 2 is also stirred and heated by the rotational heating method.

[0024] like Figures 1-13 As shown, during the conveying of material products of different shapes after extrusion molding by the double helix extrusion mechanism 5, the soft material products are easily deformed due to changes in external temperature and the friction of the conveyor belt on the receiving conveyor 6, affecting the overall integrity and molding degree of the product. The receiving conveyor 6 is equipped with a shaping component that is matched with the heating component above the cutting mechanism 7. The shaping component includes a three-way pipe 121 connected to the cold outlet of the integrated heating and cooling machine 111, and a cold delivery pipe 122 connected to the outer end of the three-way pipe 121. Both the heating pipe 112 and the cold delivery pipe 122 are equipped with pressure boosting valves 123. The integrated heating and cooling machine 111 provides the cold source, which is supplied into the two cold delivery pipes 122 through the three-way pipe 121. The two sets of pressure boosting valves 123 pressurize the cold source flowing through the two cold delivery pipes 122. The inner ends of the two cooling pipes 122 are connected to a cloth cooling frame 124 with a temperature sensor 22, and are fixed to the receiving conveyor 6 by a bent arm. After the two cold sources are pressurized, they are concentrated into the cloth cooling frame 124. The bottom area of ​​the cloth cooling frame 124 is arrayed with direct spray holes 125. The pressurized cold source supplied into the cloth cooling frame 124 is rapidly cooled and solidified by the direct spray holes 125 to the material products passing on the receiving conveyor 6, so that they can be quickly shaped. The cloth cooling frame 124 is arrayed with inclined spray holes 126 on both sides. The two rows of inclined spray holes 126 provide auxiliary cooling and shaping effect for the material products passing by, ensuring the integrity and molding degree of the product and improving its extrusion yield. One row of oblique spray holes 126 is close to the cutting mechanism 7. The pressurized cold source sprayed out blows away the material residue adhering to the surface of the rotating blade holder on the cutting mechanism 7, so as to prevent the residue from remaining and affecting the cutting effect of the rotating blade holder on the product, resulting in uneven cuts and gaps of different sizes, and further improving the integrity and formability of the product.

[0025] The working principle of a screw extruder is as follows: Material is first injected into the material hopper 2, which is sealed by a cover plate 3, through the discharge window formed by two sets of open feeding windows 23. Then, the integrated heating and cooling unit 111 generates a heat source, which is pressurized by the pressure boosting valve 123 on the heat supply pipe 112. The pressurized heat source then passes sequentially through the rotating end 113 and the connecting pipe 114 to the two rows of heat-conducting rods 116 on the heating head 115. Under heat conduction, the two rows of heat-conducting rods 116 uniformly heat the material in the material hopper 2. Simultaneously, the stepper motor 18 is activated and driven by the gear 19. The driven gear 20 is driven to rotate. The driven gear 20 drives the connecting pipe 114 to rotate in the rotating end 113. At the same time, the connecting pipe 114 drives the turbulence impeller 21 and the two rows of heat-conducting rods 116 on the heat distribution head 115 to rotate synchronously. This turbulence is then applied to the material in the material hopper 2, and a downward extrusion force is applied to make the material reach the double roller feeding mechanism 4. At the same time, the material in the material hopper 2 is stirred and heated by the rotational heat distribution method. After the material in the material hopper 2 is squeezed by the double roller feeding mechanism 4, it reaches the double spiral extrusion mechanism 5, ready for extrusion molding. Prior to this, according to the product shape requirements, the electric hoist, through two sets of lifting lugs 15, drives the two sets of mounting lugs 94 to the extrusion port of the double helix extrusion mechanism 5, respectively, with the twisted extrusion die 104, the three-ring extrusion die 105, or the chopstick-shaped extrusion die 106. The circuit breaker 101 is then controlled to energize the electromagnet 102. The energized electromagnet 102 then performs a lateral electromagnetic attraction on the fixed magnet 103 on the mounting lugs 94. Simultaneously, the two lifting cylinders 91 are opened, driving the two sets of lifting seats 92 upwards. 92 drives two lifting heads 93 to insert into the slots 96 of the inserting cylinder 95 on the mounting ears 94, and longitudinally inserts and positions the mounting ears 94, thus completing the rapid switching operation of the twisted extrusion die 104, the three-ring extrusion die 105, or the chopstick-shaped extrusion die 106. After the installation and switching are in place, the double helix extrusion mechanism 5 extrudes the material in a dual-channel manner through the twisted extrusion die 104, the three-ring extrusion die 105, or the chopstick-shaped extrusion die 106, and shapes it into twisted, three-ring, or chopstick-shaped material products. Furthermore, when using the twist-shaped extrusion die 104, the rotating mechanism 16 on it synchronously controls the rotation speed of the thirteen sets of discharge nozzles on the twist-shaped extrusion die 104, so that when the material is rotated and extruded, it is effectively twisted to form a twist-shaped material product. When using the three-ring extrusion die 105, the servo motor drives the swing arm and connecting rod to drive the cutting blade, which performs adaptive speed adjustment to cut the three-ring material extruded from the array of discharge holes on the three-ring extrusion die 105 into sheet products. When using the chopstick-shaped extrusion die 106, the material is directly extruded into chopstick-shaped material products through the staggered columnar discharge holes on the chopstick-shaped extrusion die 106. The extruded twist-shaped, three-ring, or chopstick-shaped material products are linearly conveyed by the conveyor belt on the receiving conveyor 6. At this time, the cutting mechanism 7 performs equidistant rotational cutting of the twist-shaped and chopstick-shaped material products conveyed on the receiving conveyor 6 to form twist-shaped and chopstick-shaped material products of equal length. During this period, the synchronous control unit 111 generates a cold source supply, which is pressurized by the three-way pipe 121 through the pressure boosting valves 123 on the two cold delivery pipes 122. The pressurized heat source then concentrates into the cooling rack 124 and passes through the direct spray holes 125 to the material products passing on the material conveyor 6, achieving rapid cooling and solidification, and enabling them to be quickly shaped. At the same time, the pressurized heat source in the cooling rack 124 is provided by two rows of inclined spray holes 126 to achieve an auxiliary cooling and shaping effect on the passing material products. Since one row of inclined spray holes 126 is close to the cutting mechanism 7, the pressurized cold source sprayed from the row of inclined spray holes 126 cools and solidifies the passing material products while blowing away the material residues adhering to the surface of the cutting mechanism 7 to prevent residue residues from remaining, so that the cut of the material products is flat and without dragging. Thus, the extrusion molding operation of twisted, three-ring, and chopstick-shaped material products is completed.

[0026] It should be noted that the specific models and specifications of the double roller feeding mechanism 4, double spiral extrusion mechanism 5, receiving conveyor 6, cutting mechanism 7, lifting cylinder 91, circuit breaker 101, electromagnet 102, rotating mechanism 16, cutting mechanism 17, integrated heating and cooling machine 111, pressure boosting valve 123, stepper motor 18, and temperature sensor 22 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0027] The power supply circuits for the double-roller feeding mechanism 4, the double-spiral extrusion mechanism 5, the receiving conveyor 6, the cutting mechanism 7, the lifting cylinder 91, the circuit breaker 101, the electromagnet 102, the rotating mechanism 16, the cutting mechanism 17, the integrated heating and cooling machine 111, the pressure boosting valve 123, the stepper motor 18, and the temperature sensor 22 are clear to those skilled in the art and will not be described in detail here.

[0028] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A screw extruder, comprising a main body (1), characterized in that: The feed port of the main body (1) is connected to the material hopper (2), and a sealing cover plate (3) is attached to the material hopper (2). The feed port of the main body (1) near the material hopper (2) is connected to the double roller feeding mechanism (4). In addition, the machine body (1) is connected to the feeding port of the double roller feeding mechanism (4) by a double spiral extrusion mechanism (5), and a receiving conveyor (6) is fixed on the outside of the machine body (1), and a cutting mechanism (7) is provided in the middle section of the receiving conveyor (6). Furthermore, side supports (8) are longitudinally arranged on both sides of the main body (1), and top insertion components are provided on the two sets of side supports (8), and a switching component that matches the top insertion component is provided on the outside of the double helix extrusion mechanism (5); It also includes a heat distribution assembly, which includes a heating and cooling integrated machine (111) disposed below the receiving conveyor (6), and a heat supply pipe (112) connected to the heat supply port of the heating and cooling integrated machine (111), and a rotating end (113) connected to the end of the heat supply pipe (112). The rotating end (113) has a connecting pipe (114) rotating inside, and the bottom end of the connecting pipe (114) passes through the sealing cover plate (3) and is connected to the heat spreader (115), and a heat conduction rod (116) is connected to the heat spreader (115) around its circumference. The heat head (115) and the heat-conducting rod (116) are set inside the material hopper (2) and are matched with the double roller feeding mechanism (4).

2. The screw extruder according to claim 1, characterized in that: The top insertion assembly includes a lifting cylinder (91) longitudinally mounted on two sets of side supports (8), and a lifting seat (92) fixed on the piston rod of the two sets of lifting cylinders (91), and a lifting head (93) longitudinally mounted on the two sets of lifting seats (92).

3. A screw extruder according to claim 2, characterized in that: The main body (1) is provided with mounting ears (94) on both sides, and insert tubes (95) are placed vertically on the outside of the mounting ears (94), and slots (96) for connecting with the lifting head (93) are opened in the two sets of insert tubes (95).

4. A screw extruder according to claim 3, characterized in that: The two sets of side supports (8) have vertical grooves (13) on their outer sides, and sliders (14) fixed to the lifting seat (92) slide in the two sets of vertical grooves (13), and lifting ears (15) are fixed on the outer side of the mounting ears (94).

5. A screw extruder according to claim 4, characterized in that: The switching assembly includes a circuit breaker (101) fixed on the side plate of the main body (1), an electromagnet (102) fixed on the frame of the main body (1), and a fixed magnet (103) that is electromagnetically attracted to the electromagnet (102) fixed on the inside of the mounting ear (94).

6. A screw extruder according to claim 5, characterized in that: The inner sides of the two sets of mounting ears (94) are respectively fixed with a twisted extrusion die (104), a three-ring extrusion die (105) and a chopstick-shaped extrusion die (106), and are connected to the extrusion port of the double helix extrusion mechanism (5).

7. A screw extruder according to claim 6, characterized in that: A rotating mechanism (16) is connected between the twisted extrusion die (104) and the double helix extrusion mechanism (5), and a cutting mechanism (17) is connected between the three-ring extrusion die (105) and the double helix extrusion mechanism (5), and columnar discharge holes are staggered on the chopstick-shaped extrusion die (106).

8. A screw extruder according to claim 7, characterized in that: A stepper motor (18) is fixed on the outside of the sealing cover plate (3), and a drive gear (19) is sleeved on the output shaft of the stepper motor (18). A driven gear (20) meshes on the outside of the drive gear (19). The driven gear (20) is sleeved on the connecting pipe (114), and a turbulence impeller (21) for turbulent discharge of material hopper (2) is connected between the connecting pipe (114) and the heating head (115).

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