Mixed screw and single-screw 3D printer nozzle applying same

Abstract

The invention relates to the technical field of 3D printer nozzles, in particular to a mixed screw and a single-screw 3D printer nozzle applying the same, the mixed screw comprises a rod body part, main body threads are fixed on the rod body part, a limiting boss is fixed at the upper end of the rod body part, and a rotating rod is fixed at the upper end of the limiting boss. The integrated structure is adopted, the overall firmness can be fully improved, directional movement of materials can be effectively controlled by controlling the rotating direction of the rod body part and the main body thread, the material moving direction can be controlled by controlling the rotating direction, and meanwhile through the arrangement of the multiple mixing elements, the mixing efficiency is improved. Materials can move from a gap between two adjacent mixing elements; the original single runner is changed into multi-runner simultaneous extrusion, so that the high-efficiency distribution mixing performance is realized; the shapes of a plurality of mixing elements are controlled through a hyperbolic curve, so that the melt is subjected to a process from convergence to divergence for more than two times, and the dispersing and mixing performance is more efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printer nozzles, and in particular to a mixing screw and a single-screw 3D printer nozzle using the screw. Background Art

[0002] 3D printing technology is an innovative manufacturing technology that integrates technologies such as intelligent manufacturing, green manufacturing and cutting-edge materials. It is widely used in the production of aerospace parts, medical bone replacement and automotive parts manufacturing. As one of the branches of 3D printing technology, screw 3D printing has the advantages of achieving "one-stop" melt forming of materials, low energy consumption, low cost and strong decompression ability. However, this method also has some limitations, including poor mixing effect and uneven extrusion. These problems pose a major obstacle to the melt blending and extrusion of multiple materials and the improvement of product precision, so it is necessary to improve the existing 3D printing equipment nozzle assembly. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a mixing screw and a single-screw 3D printer nozzle using the screw.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A mixing screw comprises a rod body, a main thread is fixed on the rod body, a limiting boss is fixed on the upper end of the rod body, a rotating rod is fixed on the upper end of the limiting boss, a conical head is fixed on the lower end of the rod body, and a plurality of mixing elements are fixed at equal intervals on one end of the rod body close to the conical head;

[0006] The rod body, main body thread, mixing element, conical head, limiting boss and rotating rod are integrally formed.

[0007] Compared with the prior art, the present application adopts an integrated molding structure, which can fully improve the overall firmness, and can effectively control the directional movement of the material by controlling the rotation direction of the rod body and the main thread, and can control the direction of material movement by controlling the rotation direction. At the same time, through the setting of multiple mixing elements, the material can be moved from the gap between two adjacent mixing elements; the original single flow channel is converted into multiple flow channels for simultaneous extrusion to achieve efficient distributed mixing performance; the shape of multiple mixing elements is controlled by a hyperbola, so that the melt undergoes more than two convergence to divergence processes, and has more efficient dispersed mixing performance.

[0008] The present invention also proposes a single-screw 3D printer nozzle using a mixing screw, which is suitable for the above-mentioned mixing screw, including a barrel, wherein the mixing screw is located in the barrel, and the lower end of the barrel is detachably connected to a barrel head, and a nozzle is installed at the lower end of the barrel head, and the nozzle is located at the lower end of the mixing screw;

[0009] The mixing screw is connected with a power mechanism, a positioning plate is arranged on the power mechanism, a feeding mechanism is arranged on the positioning plate, the feeding mechanism is located at the lower end of the power mechanism, and the feeding mechanism is connected with a barrel.

[0010] Compared with the prior art, the present application can provide power for the movement of materials through the power and feeding mechanism and facilitate the addition of materials as needed, and can effectively keep the materials in a molten state by heating so as to output the molten materials, thereby facilitating 3D printing operations.

[0011] Preferably, a water cooling device and two heating devices are installed at the upper end of the barrel, and the barrel is located at the upper end of the two heating devices.

[0012] Furthermore, the water cooling device can effectively cool the material to avoid heat transfer upward and affect the upper material to make it melt. At the same time, the two heating devices can fully heat and melt the material during the downward movement, ensuring that the molten material moves downward.

[0013] Preferably, the barrel head is inserted into the lower end of the barrel, a lifting mechanism is provided in the barrel head, a mounting cavity is provided in the barrel head, a squeezing mechanism is provided at the bottom of the mounting cavity, a threaded collar is detachably connected to the squeezing mechanism, a high-pressure expansion bag is provided in the mounting cavity, the squeezing mechanism is connected to the high-pressure expansion bag, an annular opening is provided on the side wall at one end of the mounting cavity, the high-pressure expansion bag passes through the annular opening and conflicts with the side wall of the barrel located in the barrel head, a plurality of limit rods are slidably installed on the upper end of the mounting cavity, the limit rods are connected to the high-pressure expansion bag, and one end of the limit rod passes through the mounting cavity and extends into the barrel.

[0014] Furthermore, the operation of the lifting mechanism can make the extrusion plate rise in the installation cavity, so that the high-pressure expansion bag can be squeezed. The high-pressure gas in the high-pressure expansion bag expands and contacts the outside of the barrel under the extrusion effect, which is helpful for sealing operations. At the same time, in actual production and preparation, the high-pressure expansion bag adopts high-temperature resistant material, which can improve the use effect, and can be quickly connected with the barrel through the action of the limit rod, which can fully improve the firmness of the connection between the barrel and the barrel head.

[0015] Preferably, the lifting mechanism includes an extrusion plate slidably mounted on the bottom of the installation cavity, a lifting ring is fixed to the lower end of the extrusion plate, lifting ports are opened on both sides of the bottom of the installation cavity, both ends of the lifting ring respectively pass through the two lifting ports and extend to the outside of the barrel head, and the lifting ring and the threaded collar are detachably connected.

[0016] Furthermore, by rotating the threaded collar, the connecting hole can be driven to rise, and the rising of the connecting hole can cause the lifting ring to rise, and the lifting ring can drive the extrusion plate to rise, so that the extrusion plate can quickly come into contact with the high-pressure expansion bag to squeeze the space where the high-pressure expansion bag is located, which can make the gas in the high-pressure expansion bag move in a directional manner and control the operation of corresponding components.

[0017] Preferably, an annular cavity is provided at the lower end of the threaded collar, and two connecting holes are provided on the side wall at one end of the annular cavity. Two balls are installed in the annular cavity, and a threaded tube is rotatably sleeved in the ball bearings. The two threaded tubes correspond to the two connecting holes respectively, and a bolt is threaded in the threaded tube, and one end of the bolt is threaded into the lifting ring.

[0018] Furthermore, in actual use, the staff can rotate the bolt to screw it into the threaded tube and connect the bolt and the lifting ring. At the same time, the bolt will enter the connecting hole. When the threaded ring is rotated and lifted, the position of the connecting hole can be effectively limited by the action of the bolt. At the same time, the ball can move in the annular cavity to effectively adapt to the rotation of the threaded ring.

[0019] Preferably, the power mechanism includes a motor seat, a stepper motor is installed at the upper end of the motor seat, a coupling is installed in the motor seat, the output shaft of the stepper motor is connected to the coupling, the mixing screw is connected to the coupling, a plurality of bearings are installed at equal intervals at the bottom of the motor seat, the plurality of bearings are distributed in a circle, the plurality of bearings are in conflict with the mixing screw, and the motor seat is installed on a positioning plate.

[0020] Furthermore, the coupling can drive the rotating rod to rotate through the stepper motor, and the rotation direction of the rotating rod can be effectively controlled to move the material downward; at the same time, the stability of the rotation of the rotating rod can be ensured through the action of the bearing.

[0021] Preferably, the feeding mechanism includes a fixing plate fixed to the lower end of the positioning plate, a supporting plate is fixed to the lower end of the fixing plate, the supporting plate and the barrel are fixedly connected, a storage bin is fixed to one side of the positioning plate, an electric push rod is fixed to the side close to the storage bin and the positioning plate, the piston rod end of the electric push rod is detachably connected with a material blocking baffle, the material blocking baffle corresponds to the material outlet of the storage bin, a feed plate is fixed to one side of the lower end of the storage bin, the feed plate is located at the lower end of the material outlet of the storage bin, a hopper is opened on the fixing plate, the lower end of the feed plate is located at the upper end of the hopper, and the mixing screw is penetrated and arranged in the hopper.

[0022] Furthermore, the electric push rod can drive the material blocking baffle to rise and fall, and can control the material in the storage bin to enter the hopper through the feed plate, so as to facilitate the control of material addition.

[0023] Preferably, a hexagon socket head screw is penetrated through the piston rod of the electric push rod, and the hexagon socket head screw is screwed into the material blocking baffle.

[0024] Furthermore, the electric push rod and the material blocking baffle can be connected by means of the hexagon socket cylindrical head screw, and the positional relationship between the material blocking baffle and the material storage bin can be controlled, so as to facilitate the control of whether the material falls.

[0025] Preferably, a plurality of hexagon socket round head screws are penetrated through the positioning plate.

[0026] Furthermore, the installation and connection can be performed quickly.

[0027] The beneficial effects of the present invention are:

[0028] 1. Through the setting of multiple mixing elements, the material can be moved from the gap between two adjacent mixing elements; the original single flow channel is changed to multiple flow channels for simultaneous extrusion to achieve efficient distribution mixing performance; the shapes of multiple mixing elements are controlled by hyperbolas, so that the melt undergoes more than two convergence to divergence processes, with more efficient dispersion mixing performance;

[0029] 2. The stepper motor can make the coupling drive the rotating rod to rotate, which can effectively control the rotation direction of the rotating rod so as to move the material downward; at the same time, the bearing can ensure the stability of the rotating rod;

[0030] 3. The electric push rod can drive the material blocking baffle to rise and fall, and can control the material in the storage bin to enter the hopper through the feed plate, which is convenient for controlling the addition of materials;

[0031] 4. The connecting hole can be driven to rise by rotating the threaded collar, and the lifting ring can be driven to rise by the rising of the connecting hole, so that the extrusion plate can be driven to rise, so that the extrusion plate can quickly contact the high-pressure expansion bag to squeeze the space where the high-pressure expansion bag is located, and the gas in the high-pressure expansion bag can be directed to move, and the operation of the corresponding components can be controlled; the high-pressure gas in the high-pressure expansion bag expands and contacts the outside of the barrel under the extrusion action, which is helpful for sealing operations. At the same time, in actual production and preparation, the high-pressure expansion bag is made of high-temperature resistant material, which can improve the use effect, and can be quickly connected with the barrel through the action of the limit rod, which can fully improve the firmness of the connection between the barrel and the barrel head. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A structural diagram of a mixing screw proposed by the present invention;

[0033] Figure 2 A cross-sectional view of a single-screw 3D printer nozzle using a mixing screw proposed by the present invention;

[0034] Figure 3 A structural diagram of a single-screw 3D printer nozzle using a mixing screw proposed by the present invention;

[0035] Figure 4 A connection structure diagram of a barrel and a barrel head in a single-screw 3D printer nozzle using a mixing screw proposed by the present invention;

[0036] Figure 5 The present invention is attached Figure 4 A magnified image of point A;

[0037] In the figure: 1 stepper motor, 2 electric push rod, 3 storage bin, 4 material blocking baffle, 5 hexagon socket cylindrical head screw, 6 feeding plate, 7 hopper, 8 rod body, 9 water cooling device, 10 barrel, 11 heating device, 12 barrel head, 13 nozzle, 14 motor seat, 15 coupling, 16 positioning plate, 17 hexagon socket flat round head screw, 18 bearing, 19 fixing plate, 20 support plate, 21 mixing element, 22 main body thread, 23 limiting boss, 24 rotating rod, 25 conical head, 26 limiting rod, 27 high-pressure expansion bag, 28 installation cavity, 29 extrusion plate, 30 lifting ring, 31 lifting port, 32 threaded collar, 33 annular cavity, 34 connecting hole, 35 ball, 36 threaded pipe, 37 bolt. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely 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.

[0039] Reference Figure 1-2A mixing screw comprises a rod body 8, a main thread 22 is fixed on the rod body 8, a limiting boss 23 is fixed on the upper end of the rod body 8, a rotating rod 24 is fixed on the upper end of the limiting boss 23, a conical head 25 is fixed on the lower end of the rod body 8, and a plurality of mixing elements 21 are fixed at equal intervals on one end of the rod body 8 close to the conical head 25; in actual production and preparation, there is a gap between two adjacent mixing elements 21, so that the molten material can flow through the position between the two mixing elements 21, and at the same time, the original single flow channel is converted into multiple flow channels for simultaneous extrusion to achieve efficient distributed mixing performance; the shape of the mixing element is controlled by a hyperbola, so that the melt undergoes more than two convergence to divergence processes, and has more efficient dispersed mixing performance.

[0040] Reference Figure 1-2 The rod body 8, the main thread 22, the mixing element 21, the conical head 25, the limiting boss 23 and the rotating rod 24 are integrally formed. In actual production and preparation, the aspect ratio of the mixing screw is 1:16, and a plurality of mixing elements 21 with a total length of 20 mm are arranged near the conical head 25.

[0041] Reference Figure 2-5 A single-screw 3D printer nozzle using a mixing screw is suitable for the above-mentioned mixing screw, including a barrel 10, the mixing screw is located in the barrel 10, the lower end of the barrel 10 is detachably connected to a barrel head 12, the lower end of the barrel head 12 is equipped with a nozzle 13, and the nozzle 13 is located at the lower end of the mixing screw; during actual production and preparation, the rod body 8 and the main thread 22 are located in the barrel 10, which can make the material move downward in the barrel 10, and at the same time, the conical head 25 can be located in the barrel head 12, which can effectively make the molten material discharged through the nozzle 13, and at the same time, the rotating rod 24 is connected to the corresponding power mechanism to provide power for the rotation of the rotating rod 24.

[0042] Reference Figure 2-5 A power mechanism is connected to the mixing screw, a positioning plate 16 is provided on the power mechanism, a feeding mechanism is provided on the positioning plate 16, the feeding mechanism is located at the lower end of the power mechanism, the feeding mechanism is connected to the barrel 10, the power mechanism can make the rotating rod 24 rotate so as to make the mixing screw rotate, and the feeding mechanism can control the addition of materials.

[0043] Reference Figure 2-3 A water cooling device 9 and two heating devices 11 are installed at the upper end of the barrel 10, and the barrel 10 is located at the upper end of the two heating devices 11; the water cooling device 9 can effectively cool the barrel 10 to avoid heat from moving upward and affecting the upper material to make it melt. At the same time, the two heating devices 11 can fully heat and melt the material during the downward movement, ensuring that the molten material moves downward.

[0044] Reference Figure 2 , 4 5. The barrel head 12 is plugged into the lower end of the barrel 10. A lifting mechanism is provided in the barrel head 12. A mounting cavity 28 is provided in the barrel head 12. A squeezing mechanism is provided at the bottom of the mounting cavity 28. A threaded collar 32 is detachably connected to the squeezing mechanism. A high-pressure expansion bag 27 is provided in the mounting cavity 28. The squeezing mechanism is connected to the high-pressure expansion bag 27. An annular opening is provided on the side wall at one end of the mounting cavity 28. The high-pressure expansion bag 27 penetrates the annular opening and conflicts with the side wall of the barrel 10 located in the barrel head 12. A plurality of limit rods 26 are slidably installed on the upper end of the mounting cavity 28. The limit rods 26 are connected to the high-pressure expansion bag 27. The limit rods 26 are connected to the high-pressure expansion bag 27. One end of 6 passes through the installation cavity 28 and extends into the barrel 10; the operation of the lifting mechanism can make the extrusion plate 29 rise in the installation cavity 28, so that the high-pressure expansion bag 27 can be squeezed, and the high-pressure gas in the high-pressure expansion bag 27 expands under the extrusion effect and contacts the outer side of the barrel 10, which is helpful for sealing operation. The high-pressure expansion bag 27 is made of high-temperature resistant material. At the same time, in actual production and preparation, the high-pressure expansion bag 27 is made of high-temperature resistant material, which can improve the use effect, and through the action of the limit rod 26, it can quickly connect with the barrel 10, which can fully improve the firmness of the connection between the barrel 10 and the barrel head 12.

[0045] Reference Figure 2 , 4 5. The lifting mechanism includes an extrusion plate 29 slidably mounted on the bottom of the installation cavity 28, a lifting ring 30 is fixed at the lower end of the extrusion plate 29, and lifting ports 31 are opened on both sides of the bottom of the installation cavity 28. The two ends of the lifting ring 30 respectively penetrate the two lifting ports 31 and extend to the outside of the barrel head 12, and the lifting ring 30 and the threaded collar 32 are detachably connected; the threaded collar 32 can be rotated to drive the connecting hole 34 to rise, and the lifting ring 30 can be raised by the rising of the connecting hole 34. The lifting ring 30 can drive the extrusion plate 29 to rise, so that the extrusion plate 29 can quickly contact the high-pressure expansion bag 27 to squeeze the space where the high-pressure expansion bag 27 is located, so that the gas in the high-pressure expansion bag 27 can be directed to move, and the operation of the corresponding components can be controlled.

[0046] Reference Figure 2 , 45. An annular cavity 33 is provided at the lower end of the threaded collar 32. Two connecting holes 34 are provided on the side wall at one end of the annular cavity 33. Two balls 35 are installed in the annular cavity 33. A threaded tube 36 is rotatably sleeved in the ball 35. The two threaded tubes 36 correspond to the two connecting holes 34 respectively. A bolt 37 is threaded in the threaded tube 36. One end of the bolt 37 is threaded into the lifting ring 30. In actual use, the staff can rotate the bolt 37 to screw it into the threaded tube 36, and connect the bolt 37 to the lifting ring 30. When the threaded collar 32 is rotated and lifted, the position of the connecting hole 34 can be effectively limited by the action of the bolt 37. At the same time, the ball 35 can move in the annular cavity 33 to effectively adapt to the rotation of the threaded collar 32.

[0047] Reference Figure 2-3 The power mechanism includes a motor base 14, a stepper motor 1 is installed on the upper end of the motor base 14, a coupling 15 is installed in the motor base 14, the output shaft of the stepper motor 1 is connected to the coupling 15, the mixing screw is connected to the coupling 15, a plurality of bearings 18 are installed at equal intervals at the bottom of the motor base 14, the plurality of bearings 18 are distributed in a circle, the plurality of bearings 18 are in conflict with the mixing screw, and the motor base 14 is installed on the positioning plate 16; the stepper motor 1 can make the coupling 15 drive the rotating rod 24 to rotate, and the rotation direction of the rotating rod 24 can be effectively controlled so as to move the material downward; at the same time, the stability of the rotation of the rotating rod 24 can be ensured by the action of the bearing 18.

[0048] Reference Figure 2-3 The feeding mechanism includes a fixed plate 19 fixed to the lower end of the positioning plate 16, a support plate 20 is fixed to the lower end of the fixed plate 19, the support plate 20 and the barrel 10 are fixedly connected, a storage bin 3 is fixed to one side of the positioning plate 16, an electric push rod 2 is fixed to the side close to the storage bin 3 and the positioning plate 16, the piston rod end of the electric push rod 2 is detachably connected with a material blocking baffle 4, the material blocking baffle 4 corresponds to the discharge port of the storage bin 3, a feeding plate 6 is fixed to one side of the lower end of the storage bin 3, the feeding plate 6 is located at the lower end of the discharge port of the storage bin 3, a hopper 7 is opened on the fixed plate 19, the lower end of the feeding plate 6 is located at the upper end of the hopper 7, and a mixing screw is arranged in the hopper 7; the electric push rod 2 can drive the material blocking baffle 4 to rise and fall, and can control the material in the storage bin 3 to enter the hopper 7 through the feeding plate 6, so as to facilitate the control of material addition.

[0049] Reference Figure 2 A hexagon socket cylindrical head screw 5 is penetrated on the piston rod of the electric push rod 2, and the hexagon socket cylindrical head screw 5 is screwed into the material blocking baffle 4; the electric push rod 2 and the material blocking baffle 4 can be connected through the hexagon socket cylindrical head screw 5, and the electric push rod 2 can drive the material blocking baffle 4 to move up and down; a plurality of hexagon socket flat round head screws 17 are penetrated on the positioning plate 16; it can be installed quickly.

[0050] In the present invention, the stepping motor 1 and the heating device 11 work together to melt, compress and homogenize the pellets entering the barrel 10 until they are finally extruded into wires, and then stacked layer by layer according to a preset path to form a three-dimensional model; therefore, the phase change, movement form and stress condition of the melt in the barrel 10 will directly affect the quality and precision of the molded part after extrusion;

[0051] Control the lifting of the material blocking baffle 4. By controlling the lifting of the material blocking baffle 4, the micro-holes in the storage bin 3 can control the quantitative input of the granular material, and the material can be stably moved downward by rotating the mixing screw. The stepper motor 1 is connected to the motor base 14 by screws; the motor shaft and the mixing screw of the stepper motor 1 are connected by the coupling 15, and the electric push rod 2 is connected to the material blocking baffle 4 by the hexagon socket head screw 5 to realize the lifting function of the material blocking baffle 4;

[0052] In actual production and preparation, two electric push rods 2 or one electric push rod 2 can be installed as needed to control the lifting and lowering of the material blocking baffle 4.

[0053] The material blocking baffle 4 is connected to the external discharge hole of the storage bin 3; the bottom of the storage bin 3 is connected to the hopper 7 through the feed plate 6; the barrel 10 is connected to the positioning plate 16 through the fixing plate 19, and the hopper 7 is connected to the upper end of the barrel 10 through the support plate 20. The barrel 10 is equipped with a mixing screw, and the lower end of the barrel 10 is connected to the barrel head 12 through a threaded connection to facilitate the subsequent cleaning work. The nozzle 13 is installed on the lower side of the barrel head 12; the rotating rod 24 at the upper end of the mixing screw is installed with the bearing 18 hole in the motor seat 14 through an interference fit, positioned by the limiting boss 23, and assembled coaxially with the barrel 10; a heating device 11 and a water cooling device 9 are also provided on the outside of the barrel 10; the water cooling device 9 is installed in the feeding section of the mixing screw, and the heating device 11 is respectively installed in the compression section and the homogenization section of the mixing screw;

[0054] The length-to-diameter ratio of the mixing screw is 1:16, and a mixing element 21 with a total length of 20 mm is arranged near the conical head 25. The melt can be transformed from a single flow channel in the conventional scheme to multiple flow channels for simultaneous extrusion through the mixing element 21, so that the 3D printing nozzle of the mixing screw has a more efficient distribution mixing performance; the shape composed of multiple mixing elements 21 is controlled by a hyperbola, so that the melt undergoes more than two convergence to divergence processes when passing through the mixing element 21, so that the single screw 3D printing nozzle has a more efficient dispersion mixing performance; two rows of multiple mixing elements 21 are arranged circumferentially at the front end of the mixing screw, and the number of mixing elements 21 in each row is four, and the rest is the main thread 22; the material stays in the barrel 10 for a longer time, and the shear stress and tensile stress it is subjected to are more severe, so that the material is fully mixed and uniform;

[0055] The granular material in the storage bin 3 is quantitatively transported to the hopper 7 under the action of the electric push rod 2, and at the same time, as the stepping motor 1 drives the mixing screw to rotate, the granular material enters the barrel 10; after entering the barrel 10, the granular material will undergo three processes, including a solid section, a compression section, and a homogenization section. Under the action of the water cooling device 9, the granular material in the solid section is further compressed and decompressed, providing a basis for subsequent extrusion molding; under the action of the heating device 11, the solid granular material in the compression section changes into a glassy state and then into a molten state; finally, homogenization, constant pressure, and constant temperature are performed in the homogenization section to achieve the purpose of extrusion molding;

[0056] The mixing screw can realize the melt blending and extrusion of multiple materials, and improve the mixing performance of the mixing screw; for different processing occasions, the length of the mixing screw and the effective length of the mixing element 21 can be adjusted according to different working conditions.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mixing screw, comprising a rod body (8), a main thread (22) being fixed on the rod body (8), a limiting boss (23) being fixed at the upper end of the rod body (8), a rotating rod (24) being fixed at the upper end of the limiting boss (23), a conical head (25) being fixed at the lower end of the rod body (8), and a plurality of mixing elements (21) being fixed at equal intervals at one end of the rod body (8) close to the conical head (25); The rod body (8), the main body thread (22), the mixing element (21), the conical head (25), the limiting boss (23) and the rotating rod (24) are integrally formed.

2. A single screw 3D printer nozzle using a mixing screw, suitable for a mixing screw in the above right 1, characterized in that: It comprises a barrel (10), wherein the mixing screw is located in the barrel (10), the lower end of the barrel (10) is detachably connected to a barrel head (12), the lower end of the barrel head (12) is provided with a nozzle (13), and the nozzle (13) is located at the lower end of the mixing screw; The mixing screw is connected to a power mechanism, a positioning plate (16) is provided on the power mechanism, a feeding mechanism is provided on the positioning plate (16), the feeding mechanism is located at the lower end of the power mechanism, and the feeding mechanism is connected to the barrel (10).

3. A single screw 3D printer nozzle using a mixing screw according to claim 2, characterized in that: A water cooling device (9) and two heating devices (11) are installed at the upper end of the barrel (10), and the barrel (10) is located at the upper ends of the two heating devices (11).

4. A single screw 3D printer nozzle using a mixing screw according to claim 2, characterized in that: The barrel head (12) is plugged into the lower end of the barrel (10); a lifting mechanism is provided in the barrel head (12); a mounting cavity (28) is provided in the barrel head (12); a squeezing mechanism is provided at the bottom of the mounting cavity (28); a threaded collar (32) is detachably connected to the squeezing mechanism; a high-pressure expansion bag (27) is provided in the mounting cavity (28); the squeezing mechanism is connected to the high-pressure expansion bag (27); an annular opening is provided on a side wall at one end of the mounting cavity (28); the high-pressure expansion bag (27) passes through the annular opening and contacts with the side wall of the barrel (10) located in the barrel head (12); a plurality of limiting rods (26) are slidably installed at the upper end of the mounting cavity (28); the limiting rods (26) are connected to the high-pressure expansion bag (27); one end of the limiting rods (26) passes through the mounting cavity (28) and extends into the barrel (10).

5. A single screw 3D printer nozzle using a mixing screw according to claim 4, characterized in that: The lifting mechanism comprises an extrusion plate (29) slidably mounted on the bottom of the installation cavity (28); a lifting ring (30) is fixed at the lower end of the extrusion plate (29); lifting openings (31) are provided on both sides of the bottom of the installation cavity (28); two ends of the lifting ring (30) respectively pass through the two lifting openings (31) and extend to the outside of the barrel head (12); the lifting ring (30) and the threaded collar (32) are detachably connected.

6. A single screw 3D printer nozzle using a mixing screw according to claim 4, characterized in that: An annular cavity (33) is provided at the lower end of the threaded collar (32), and two connecting holes (34) are provided on a side wall at one end of the annular cavity (33). Two balls (35) are installed in the annular cavity (33), and a threaded tube (36) is rotatably sleeved in the balls (35). The two threaded tubes (36) correspond to the two connecting holes (34) respectively. A bolt (37) is threaded in the threaded tube (36), and one end of the bolt (37) is threaded into the lifting ring (30).

7. A single screw 3D printer nozzle using a mixing screw according to claim 2, characterized in that: The power mechanism comprises a motor seat (14), a stepper motor (1) is mounted on the upper end of the motor seat (14), a coupling (15) is mounted inside the motor seat (14), an output shaft of the stepper motor (1) is connected to the coupling (15), the mixing screw is connected to the coupling (15), a plurality of bearings (18) are mounted at equal intervals on the bottom of the motor seat (14), the plurality of bearings (18) are distributed in a circular shape, the plurality of bearings (18) are in contact with the mixing screw, and the motor seat (14) is mounted on a positioning plate (16).

8. A single screw 3D printer nozzle using a mixing screw according to claim 2, characterized in that: The feeding mechanism comprises a fixing plate (19) fixed to the lower end of the positioning plate (16), a supporting plate (20) fixed to the lower end of the fixing plate (19), the supporting plate (20) and the barrel (10) being fixedly connected, a material storage bin (3) fixed to one side of the positioning plate (16), an electric push rod (2) fixed to the side of the material storage bin (3) close to the positioning plate (16), a piston rod end of the electric push rod (2) being detachably connected to a material blocking baffle (4), the material blocking baffle (4) corresponding to the material outlet of the material storage bin (3), a material conveying plate (6) fixed to one side of the lower end of the material storage bin (3), the material conveying plate (6) being located at the lower end of the material outlet of the material storage bin (3), a hopper (7) being provided on the fixing plate (19), the lower end of the material conveying plate (6) being located at the upper end of the hopper (7), and the mixing screw being arranged through the hopper (7).

9. A single screw 3D printer nozzle using a mixing screw according to claim 8, characterized in that: A hexagon socket head screw (5) is passed through the piston rod of the electric push rod (2), and the hexagon socket head screw (5) is screwed into the material blocking baffle (4).

10. The single screw 3D printer nozzle using a mixing screw according to claim 2, characterized in that: The positioning plate (16) is provided with a plurality of hexagon socket round head screws (17) extending therethrough.

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