Preparation device and method of high-performance 3D printing nylon powder

Abstract

The invention relates to the technical field of nylon powder preparation, in particular to a preparation device and method for high-performance 3D printing nylon powder. A preparation device for high-performance 3D printing nylon powder comprises a rack and a reaction shell which are connected with each other, and further comprises a vibration mixing frame, servo motors and a variable-speed transmission system driven by the servo motors are installed on the rack, and a first transverse shaft with the rotating speed periodically variable is in transmission connection with the variable-speed transmission system; and a linkage module driven by the first transverse shaft is mounted on the rack. The single servo motor linkage structure has the beneficial effects that the servo motor is used for driving the variable-speed transmission system, so that the rotating speed of the first transverse shaft is periodically variable, and meanwhile, the first transverse shaft drives the linkage module to drive the half-cone transmission body to rotate and move back and forth, so that the vibration mixing frame moves back and forth within a set stroke; the variable-speed stirring and variable-stroke vibration reaction of materials are synchronously realized, the reaction efficiency is improved, and the limitation of a traditional reaction kettle is broken through.

Description

Technical Field

[0001] The present invention relates to the technical field of nylon powder preparation, and specifically to a preparation device and method for high-performance 3D printing nylon powder. Background Technique

[0002] At present, the preparation methods of nylon powder materials for 3D printing mainly include mechanical cryogenic pulverization method, direct polymerization method and solvent precipitation method. The powders obtained by the mechanical cryogenic pulverization method and the emulsion polymerization method have irregular morphologies and are difficult to form spherical or near-spherical particles. The powder with regular morphology and spherical or near-spherical particles can be obtained by the solvent precipitation method, which is the most widely used method for preparing 3D printing nylon powder at present. In the prior art, the patent document with the publication number of CN104194326A discloses a preparation method of nylon powder for 3D printing, including the following steps: S1. Nylon modification, putting nylon 12 base material into a mixer, spraying and adding additives in the nylon 12 base material. The additives are surfactants, light absorbers, compatibilizers, viscosity reducers, antioxidants and thermal conductive powders dissolved in organic solvents. After uniformly stirring the nylon 12 base material and the additives and drying, a modified nylon base material is obtained. Melting and emulsifying: adding the modified nylon base material, solvent oil and emulsifier into a reaction kettle, stirring and heating to 180-260 °C to dissolve the modified nylon base material into a liquid, and stirring and emulsifying at a rotation speed of 500-1500 revolutions per minute for 15-30 minutes to form a nylon high-temperature emulsion. In the prior art, various reaction kettles for realizing the above preparation process have appeared, but the existing reaction kettles have the following technical problems when in use:

[0003] 1. The stirring method of the traditional nylon preparation reaction kettle has a single power, the stirring effect is poor, the stirring components can usually only perform simple rotational motion, the stirring direction of the materials is fixed, and it is easy to have stirring dead angles, resulting in uneven mixing of the materials, unable to fully turn over the materials, and difficult to achieve uniform fusion of the additives and the nylon base material, affecting the comprehensive performance of the nylon powder;

[0004] 2. When the traditional reaction kettle prepares nylon powder, it is difficult to synchronously realize the variable speed and variable stroke vibration reaction of the materials in the reaction kettle through a single servo motor linkage structure, and then the reaction efficiency of the reaction kettle is relatively limited;

[0005] Based on this, the present invention provides a preparation device and method for high-performance 3D printing nylon powder to solve the problems raised in the above background technique. Summary of the Invention

[0006] The present invention aims at the technical problems existing in the prior art and provides a high-performance 3D printing nylon powder preparation device and method to solve the problems that the stirring mode of the existing nylon preparation reactor is relatively single power, the stirring effect is poor, and the traditional reactor is difficult to synchronously realize the variable speed and variable stroke vibration response of the material in the reactor through the single servo motor linkage structure when preparing nylon powder, which leads to the reaction efficiency of the reactor being relatively limited.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: a high-performance 3D printing nylon powder preparation device, comprising a frame and a reaction shell connected to each other, and also comprising a vibration mixing frame, the frames are respectively equipped with servo motors and a variable speed transmission system driven by the servo motor, the variable speed transmission system is connected to a first horizontal axis with a periodically variable speed, the frame is equipped with a linkage module driven by the first horizontal axis, the linkage module is connected to a semi-conical transmission body that can rotate and can move back and forth within a set stroke, the vibration mixing frame is driven and moved back and forth by the linkage module, the reciprocating movement stroke of the vibration mixing frame is adjusted by the linkage module, a rotation frame is rotatably installed on the inner wall of the vibration mixing frame, a vibration mixing shaft is rotatably installed on the inner wall of the rotation frame, the rotation frame and the vibration mixing shaft rotate in opposite directions, an active bevel gear is installed on the vibration mixing shaft, and a group of dynamic mixing systems is installed on the rotation frame;

[0008] The dynamic mixing system includes a fixed mixing shaft rotatably connected to the rotation frame, a driven bevel gear meshing with the driving bevel gear is fixedly installed on the tail end of the fixed mixing shaft, a dynamic mixing shaft is provided on the transmission sleeve of the fixed mixing shaft, a plurality of stirring paddles are installed on the dynamic mixing shaft, and a pulse inflation mechanism is installed on the frame, and the dynamic mixing shaft is driven by the pulse inflation mechanism and is reciprocated along the axial direction of the fixed mixing shaft.

[0009] The beneficial effects of the present invention are:

[0010] 1. The present invention utilizes a servo motor to drive a variable speed transmission system, so that the speed of the first horizontal axis is periodically variable. At the same time, the first horizontal axis drives the linkage module to drive the semi-conical transmission body to rotate and move back and forth, thereby causing the vibration mixing frame to move back and forth within a set stroke. This single servo motor linkage structure simultaneously realizes variable speed stirring and variable stroke vibration reaction of materials, improves reaction efficiency, and breaks through the limitations of traditional reactors.

[0011] 2. The present invention uses a unique design to make the rotating frame and the vibrating mixing shaft rotate coaxially and in opposite directions to drive the dynamic mixing system to work. The stirring paddle on the dynamic mixing shaft not only rotates with the dynamic mixing shaft, but also moves back and forth along the axis of the fixed mixing shaft under the action of the pulse inflation mechanism, constantly changing the stirring position, stirring the material comprehensively, avoiding stirring dead corners, significantly improving the uniformity of material mixing, achieving full fusion of additives and nylon base materials, and improving the comprehensive performance of nylon powder.

[0012] 3. In the variable speed transmission system of the present invention, the first half-tooth gear and the first driven gear are combined with the first torsion spring to make the first reciprocating lead screw rotate smoothly back and forth, and the belt limiting roller prevents the elastic synchronous transmission belt from shifting; the regular hexagon-shaped first synchronous groove and the second horizontal shaft ensure stable transmission. In the linkage module, the second half-tooth gear and the second driven gear are combined with the second torsion spring to accurately control the reciprocating displacement of the vibration mixing frame. These optimized designs improve the operation stability and service life of the equipment.

[0013] 4. The present invention installs a heating jacket, a pressure probe, a temperature probe and a single-chip microcomputer on the reaction shell. The heating jacket can heat the materials in the reaction shell to a suitable temperature to meet the process requirements; the pressure probe and the temperature probe monitor the pressure and temperature in the inner cavity of the reaction shell in real time and transmit the data to the single-chip microcomputer, and the single-chip microcomputer accurately regulates the temperature of the heating jacket and the reaction process accordingly, avoiding the influence of abnormal temperature and pressure on the quality of nylon powder preparation and ensuring the stable and consistent product quality.

[0014] On the basis of the above technical solutions, the present invention can be further improved as follows.

[0015] Further, a material valve communicating with the inner cavity of the reaction shell is installed at both the positive top and the positive bottom of the reaction shell. A heating jacket is installed on the reaction shell. A pressure probe for monitoring the pressure in the inner cavity of the reaction shell and a temperature probe for monitoring the temperature in the inner cavity of the reaction shell are respectively installed on the top of the reaction shell. A single-chip microcomputer is installed on the end face of the reaction shell. The data ends of the temperature probe and the pressure probe are both connected to the single-chip microcomputer in terms of data.

[0016] The beneficial effect of adopting the above further scheme is that before use, the addition and discharge of materials can be conveniently carried out through the material valves at the top and bottom of the reaction shell. The heating jacket can heat the materials in the reaction shell to ensure that in the melting and emulsifying step, the modified nylon base material can be heated to 180°C - 260°C and melted into a liquid to meet the process requirements;

[0017] The pressure probe and the temperature probe monitor the pressure and temperature in the inner cavity of the reaction shell in real time and transmit the data to the single-chip microcomputer. The single-chip microcomputer accurately regulates the heating temperature of the heating jacket, the reaction process, etc. according to these data, avoiding the influence of abnormal temperature and pressure on the quality of nylon powder preparation, solving the problem that the reaction conditions are difficult to accurately control in the prior art, and being able to more accurately control the reaction environment compared with the traditional preparation device, improving the stability of nylon powder preparation and the consistency of product quality.

[0018] Further, the speed transmission system includes a main shaft, a secondary shaft and a second transverse shaft rotatably connected to the frame, a synchronous belt is transmission-connected between the output end of the servo motor and the main shaft, a first bevel gear is installed on the main shaft and the secondary shaft, the two first bevel gears are meshed with each other, a second bevel gear is installed on the secondary shaft and the second transverse shaft, the two second bevel gears are meshed with each other, a first reciprocating screw is rotatably installed on the frame, the first reciprocating screw is driven and reciprocates by the second transverse shaft, a speed regulating frame is transmission-installed on the first reciprocating screw, a speed changing cone is rotatably installed on the speed regulating frame, and an elastic synchronous transmission belt is transmission-connected between the speed changing cone and the first transverse shaft.

[0019] The beneficial effect of adopting the above further scheme is that when in use, the servo motor drives the main shaft to rotate through the synchronous belt, the first bevel gear on the main shaft is meshed with the first bevel gear on the secondary shaft, thereby driving the secondary shaft to rotate, the second bevel gear on the secondary shaft is meshed with the second bevel gear on the second horizontal shaft, so that the second horizontal shaft rotates, the rotation of the second horizontal shaft drives the first reciprocating screw to reciprocate, and the first reciprocating screw drives the speed regulating frame to reciprocate;

[0020] The speed regulating frame moves back and forth, and then drives the speed-changing cone on the speed regulating frame to change its position back and forth. After the position of the speed-changing cone changes back and forth, the speed of the first horizontal axis is periodically adjusted through the elastic synchronous transmission belt.

[0021] Furthermore, a first half-toothed gear is installed on the second transverse axis, a first driven gear is fixedly installed on the first reciprocating screw rod, the first half-toothed gear is transmission-connected to the first driven gear, a first torsion spring is fixedly provided at the rotation connection between the first reciprocating screw rod and the frame, a group of belt limiting rollers are rotatably installed on the frame and at positions corresponding to both sides of the elastic synchronous transmission belt, the axis of the belt limiting roller is perpendicular to the axis of the speed change cone, a first synchronization groove with openings at both ends fixedly provided inside the speed change cone and slidingly connected to the second transverse axis, and the cross-sections of the first synchronization groove and the second transverse axis are both regular hexagons.

[0022] The beneficial effect of adopting the above further scheme is that the first half-toothed gear on the second transverse axis is connected with the first driven gear on the first reciprocating screw rod. When the first half-toothed gear rotates, it meshes with the first driven gear once every half turn, driving the first reciprocating screw rod to rotate intermittently, and cooperates with the reset effect of the first torsion spring to make the first reciprocating screw rod rotate back and forth smoothly. The belt limiting roller limits the elastic synchronous transmission belt to prevent it from shifting during the transmission process. The regular hexagonal design of the first synchronous groove and the second transverse axis ensures a stable transmission connection between the second transverse axis and the speed change cone.

[0023] This structure solves the problems of unstable screw movement and easy deviation of the belt during transmission, ensures the stable operation of the variable speed transmission system, and further guarantees the reliability of the speed adjustment of the first horizontal axis. Compared with the existing technology, it improves the stability of equipment operation and service life.

[0024] The transmission gear of the present invention is a gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a

[0025] The beneficial effect of adopting the above further scheme is that when in use, the first horizontal axis rotates to drive the second half-tooth gear to rotate, the second half-tooth gear is connected to the second driven gear, driving the second reciprocating screw to rotate, and the second reciprocating screw drives the stroke adjustment frame to move, so that the semi-conical transmission body moves back and forth within the set stroke. When the semi-conical transmission body rotates and moves back and forth, its inclined surface fits with the inclined surface of the guide inclined plate, and power is transmitted through the friction texture. Under the action of the elastic clamping piece, the vibration mixing frame is driven to move back and forth. This structure solves the problem of complex or unstable driving mode of the vibration mixing frame in the existing device, can accurately control the reciprocating displacement of the vibration mixing frame, and enhance the mixing effect of the material during the vibration mixing process. Compared with the traditional device, the uniformity of material mixing is improved, which helps to improve the quality of nylon powder.

[0026] Further, the radius of the first half-toothed gear is 5 to 8 times the radius of the first driven gear, and the radius of the second half-toothed gear is 7 to 10 times the radius of the second driven gear.

[0027] The beneficial effect of adopting the above-mentioned further scheme is that, when in use, the appropriate radius ratio of the half-tooth gear and the driven gear can adjust the rotation speed and stroke of the first and second reciprocating screws. The radius ratio of the first half-tooth gear and the first driven gear enables the first reciprocating screw to drive the speed regulating frame to move at an appropriate speed and stroke during the rotation of the second horizontal axis, and accurately adjust the speed of the first horizontal axis. The radius ratio of the second half-tooth gear and the second driven gear ensures that the second reciprocating screw can stably drive the stroke adjusting frame, thereby controlling the reciprocating displacement of the semi-conical transmission body and the vibration mixing frame. This design solves the problem of uncoordinated equipment operation caused by unreasonable transmission ratio, optimizes the overall operation performance of the equipment, and compared with the prior art, improves the transmission efficiency and operation accuracy of the equipment, and ensures the stability of the nylon powder preparation process.

[0028] Furthermore, a third synchronization groove with an opening at the rear end and slidably connected to the fixed mixing shaft is fixedly provided inside the dynamic mixing shaft, and the cross-sections of the third synchronization groove and the fixed mixing shaft are both regular hexagons.

[0029] The beneficial effect of adopting the above further scheme is that the third synchronization groove inside the dynamic mixing shaft cooperates with the regular hexagonal cross-section of the fixed mixing shaft, so that the dynamic mixing shaft can not only stably transmit on the fixed mixing shaft, but also move back and forth along the axis direction of the fixed mixing shaft under the drive of the pulse inflation mechanism. In the preparation process of nylon powder, the stirring paddle can stir the material more comprehensively as the dynamic mixing shaft moves back and forth, avoiding the occurrence of mixing dead corners, solving the problem of uneven material mixing in traditional mixing methods. Compared with the existing technology, the mixing uniformity of the material is significantly improved, and the quality of the nylon powder is improved.

[0030] Furthermore, a fourth synchronization groove with an opening at the rear end and slidably connected to the main shaft is fixedly provided inside the vibration and mixing shaft, and the cross-sections of the fourth synchronization groove and the main shaft are both regular hexagons. A counter-transmission shaft is rotatably installed on the vibration and mixing frame, and a side bevel gear is installed on the rotation frame and the vibration and mixing shaft. A counter-transmission bevel gear is installed on the counter-transmission shaft, and the two counter-transmission bevel gears are both transmission-connected with the side bevel gears, and the two side bevel gears are respectively arranged on both sides of the counter-transmission bevel gear.

[0031] The beneficial effect of adopting the above further scheme is that the fourth synchronous groove inside the vibrating and mixing shaft cooperates with the regular hexagonal cross-section of the main shaft, ensuring that the vibrating and mixing shaft can stably obtain power from the main shaft, and the reverse transmission bevel gear on the reverse transmission shaft is connected to the rotation frame and the side bevel gear on the vibrating and mixing shaft, so that the rotation frame and the vibrating and mixing shaft rotate coaxially in opposite directions. When preparing nylon powder, this reverse rotating structure increases the turning effect of the material, so that the material is subjected to stirring force in different directions, further improving the uniformity of material mixing, and solving the problem of single material stirring direction in existing devices. Compared with traditional stirring methods, it greatly improves the material mixing quality, which is conducive to the preparation of high-performance nylon powder.

[0032] Further, the pulse inflation mechanism includes a pump cylinder installed on the back of the reaction shell. A set of pump blades is installed at the output end of the servo motor and corresponding to the inner side of the pump cylinder. The air inlet port of the pump cylinder is connected to a filter element. First flow channels are opened on both the main shaft and the vibration mixing shaft. A second flow channel is fixedly opened inside the fixed mixing shaft. An air chamber is provided between the fixed mixing shaft and the moving mixing shaft. A T-shaped beam rod fixedly installed on the fixed mixing shaft and slidably connected to the moving mixing shaft is sleeved with a return spring limited by the moving mixing shaft. The air outlet port of the pump cylinder is connected to the first flow channel through a pipeline. The first flow channel is connected to the air chamber through the second flow channel. A pulse pressure relief valve is installed in the pipeline.

[0033] The beneficial effect of adopting the above further solution is that during use, the servo motor drives the pump blades to rotate. The pump blades suck air into the pump cylinder through the filter element. After the filtered air enters the pump cylinder, it sequentially flows through the first flow channels of the main shaft and the vibration mixing shaft and the second flow channel of the fixed mixing shaft through the pipeline, and enters the air chamber between the moving mixing shaft and the fixed mixing shaft. As the air pressure in the air chamber increases, the moving mixing shaft moves along the axis of the fixed mixing shaft under the action of the air pressure, overcoming the elastic force of the return spring. When the air pressure reaches the set value of the pulse pressure relief valve, the valve opens to relieve pressure, and the moving mixing shaft resets under the action of the return spring. In this way, the reciprocating displacement of the moving mixing shaft is realized. During this process, the stirring paddle continuously changes the stirring position under the drive of the moving mixing shaft, enhancing the stirring effect. This mechanism solves the problems of single power and poor stirring effect in the traditional stirring method. By driving the reciprocating displacement of the moving mixing shaft through pulse inflation, the material is stirred more fully. Compared with the prior art, the mixing efficiency and quality of the material in the nylon powder preparation process are improved.

[0034] Further, a method for preparing high-performance 3D printing nylon powder includes the following steps:

[0035] SS01, nylon modification: Place the nylon base material in a mixer, spray and add an auxiliary agent made by dissolving a surfactant, a light absorbent, a compatibilizer, a viscosity reducer, an antioxidant, and a heat-conducting powder in an organic solvent thereto. After fully stirring and drying with the mixer, a modified nylon base material is obtained;

[0036] SS02, melting and emulsifying: Add the modified nylon base material, solvent oil, and emulsifier to the reaction shell of the preparation device. Turn on the servo motor. The servo motor drives the variable speed transmission system. The servo motor drives the main shaft to rotate through a synchronous belt. The main shaft drives the auxiliary shaft through a first bevel gear. The auxiliary shaft then drives the second horizontal shaft through a second bevel gear. The second horizontal shaft drives the first reciprocating lead screw to rotate reciprocally, causing the speed regulating frame to move and changing the position of the variable speed cone. The rotational speed of the first horizontal shaft is periodically adjusted through an elastic synchronous belt. The rotational speed of the first horizontal shaft changes periodically, driving the moving mixing system installed thereon to stir the material. At the same time, the temperature in the reaction shell rises to 180°C - 260°C under the action of the heating jacket, melting the modified nylon base material into a liquid;

[0037] SS03. Stirring and emulsifying process: Driven by the first horizontal axis, the vibration mixing shaft rotates. The fourth synchronous groove inside it cooperates with the main shaft to stably obtain power. The reverse transmission bevel gear on the reverse transmission shaft drives the side bevel gears on the rotation and displacement frame and the vibration mixing shaft, causing the rotation and displacement frame and the vibration mixing shaft to rotate coaxially and in opposite directions. The driving bevel gear on the vibration mixing shaft drives the driven bevel gear of the dynamic mixing system, causing the static mixing shaft to rotate. The dynamic mixing shaft sleeved on the static mixing shaft through transmission rotates accordingly. The stirring paddle on the dynamic mixing shaft stirs the material. The pulse gas injection mechanism works. The servo motor drives the pump blade to rotate. Air is inhaled into the pump cylinder through the filter element and enters the pneumatic chamber between the dynamic mixing shaft and the static mixing shaft through the pipeline. When the air pressure rises, the dynamic mixing shaft moves along the axis of the static mixing shaft against the elastic force of the return spring. When the air pressure reaches the set value of the pulse pressure relief valve, pressure is relieved, and the dynamic mixing shaft resets under the action of the return spring, driving the stirring paddle to continuously change the stirring position.

[0038] SS04. Solidification and screening: After the nylon high-temperature emulsion is discharged from the reaction shell, it is quickly cooled to form a nylon suspension. The nylon suspension is subjected to solid-liquid separation using solid-liquid separation equipment, and then washed and dried to obtain spherical nylon powder. Then, nylon powder with a particle size of 30 - 100 μm for 3D printing is screened out through a grading and screening device. Description of the Drawings

[0039] Figure 1 It is a schematic diagram of the overall structure of a device for preparing high-performance 3D printing nylon powder according to the present invention;

[0040] Figure 2 According to the present invention Figure 1 Schematic diagram of the rear view perspective structure;

[0041] Figure 3 According to the present invention Figure 2 Schematic diagram of the sectional structure;

[0042] Figure 4 According to the present invention Figure 3 Schematic diagram of the enlarged partial structure at A in the present invention;

[0043] Figure 5 According to the present invention Figure 3 Schematic diagram of the enlarged partial structure at B in the present invention;

[0044] Figure 6 Schematic diagram of the structure of the dynamic mixing shaft and the servo motor according to the present invention;

[0045] Figure 7 According to the present invention Figure 6 Schematic diagram of the enlarged partial structure at C in the present invention;

[0046] Figure 8 Schematic diagram of the structure of the first horizontal axis and the second half-tooth gear according to the present invention;

[0047] Figure 9 This is a schematic structural diagram of the semi-cone transmission body of the present invention.

[0048] In the attached drawings, the list of components represented by each label is as follows:

[0049] 1. Frame; 2. Reaction shell; 3. Servo motor; 4. First horizontal shaft; 5. Semi-cone transmission body; 6. Vibration mixing frame; 7. Rotary displacement frame; 8. Vibration mixing shaft; 9. Fixed mixing shaft; 10. Moving mixing shaft; 11. Stirring paddle; 12. Material valve; 13. Heating jacket; 14. Air pressure probe; 15. Temperature probe; 16. Single-chip microcomputer; 17. Main shaft; 18. Sub-shaft; 19. Second horizontal shaft; 20. First reciprocating lead screw; 21. Speed regulation frame; 22. Variable speed cone; 23. Elastic synchronous transmission belt; 24. First half-tooth gear; 25. First driven gear; 26. First torsion spring; 27. Second driven gear; 28. Second half-tooth gear; 29. Stroke adjustment frame; 30. Elastic pressing member; 31. Reverse transmission shaft; 32. Pump barrel; 33. Pump blade; 34. Return spring; 35. T-shaped beam rod; 36. Pulse pressure relief valve; 37. Guiding inclined plate; 38. Second reciprocating lead screw; 39. Second torsion spring; 40. Elastic reset member. Specific embodiments

[0050] The principles and features of the present invention will be described below with reference to the attached drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0051] The present invention provides the following preferred embodiments

[0052] As Figures 1-9 shown, a device for preparing high-performance 3D printing nylon powder includes a frame 1 and a reaction shell 2 which are connected to each other;

[0053] A material valve 12 communicating with the inner cavity of the reaction shell 2 is installed at both the top and bottom of the reaction shell 2. A heating jacket 13 is installed on the reaction shell 2. An air pressure probe 14 for monitoring the pressure in the inner cavity of the reaction shell 2 and a temperature probe 15 for monitoring the temperature in the inner cavity of the reaction shell 2 are installed at the top of the reaction shell 2. A single-chip microcomputer 16 is installed on the end face of the reaction shell 2. The data terminals of the temperature probe 15 and the air pressure probe 14 are both connected to the single-chip microcomputer 16 in terms of data.

[0054] Before use, the addition and discharge of materials can be conveniently carried out through the material valves 12 at the top and bottom of the reaction shell 2. The heating jacket 13 can heat the materials in the reaction shell 2 to ensure that in the molten emulsification step, the modified nylon base material can be heated to 180°C - 260°C and melted into a liquid to meet the process requirements;

[0055] The pressure probe 14 and the temperature probe 15 monitor the pressure and temperature inside the inner cavity of the reaction shell 2 in real time, and transmit the data to the single-chip microcomputer 16. The single-chip microcomputer 16 precisely regulates the heating temperature of the heating jacket 13, the reaction process, etc. according to these data, avoiding the influence of abnormal temperature and pressure on the quality of nylon powder preparation, solving the problem that the reaction conditions are difficult to accurately control in the prior art. Compared with the traditional preparation device, it can more accurately control the reaction environment, improving the stability of nylon powder preparation and the consistency of product quality.

[0056] It further includes a vibration mixing frame 6. A servo motor 3 and a variable-speed transmission system driven by the servo motor 3 are respectively installed on the frame 1. A first horizontal shaft 4 with a periodically variable rotational speed is drivingly connected to the upper part of the variable-speed transmission system. A linkage module driven by the first horizontal shaft 4 is installed on the frame 1. A semi-cone transmission body 5 that can rotate and reciprocate within a set stroke is drivingly connected to the upper part of the linkage module. The vibration mixing frame 6 is driven by the linkage module and reciprocates. The reciprocating displacement stroke of the vibration mixing frame 6 is adjusted by the linkage module. A rotating displacement frame 7 is rotatably installed on the inner wall of the vibration mixing frame 6. A vibration mixing shaft 8 is rotatably installed on the inner wall of the rotating displacement frame 7. The rotating displacement frame 7 and the vibration mixing shaft 8 rotate in the opposite direction coaxially. A driving bevel gear is installed on the vibration mixing shaft 8, and a set of dynamic mixing systems are installed on the rotating displacement frame 7;

[0057] The dynamic mixing system includes a fixed mixing shaft 9 rotatably connected to the rotating displacement frame 7. A driven bevel gear meshing with the driving bevel gear is fixedly installed at the tail end of the fixed mixing shaft 9. A dynamic mixing shaft 10 is drivingly sleeved on the fixed mixing shaft 9. Multiple groups of stirring paddles 11 are installed on the dynamic mixing shaft 10. A pulse inflation mechanism is installed on the frame 1. The dynamic mixing shaft 10 is driven by the pulse inflation mechanism and reciprocates along the axis direction of the fixed mixing shaft 9.

[0058] The variable-speed transmission system includes a main shaft 17, a sub-shaft 18, and a second horizontal shaft 19 rotatably connected to the frame 1. A synchronous belt is drivingly connected between the output end of the servo motor 3 and the main shaft 17. First bevel gears are installed on both the main shaft 17 and the sub-shaft 18, and the two first bevel gears mesh with each other. Second bevel gears are installed on both the sub-shaft 18 and the second horizontal shaft 19, and the two second bevel gears mesh with each other. A first reciprocating lead screw 20 is rotatably installed on the frame 1. The first reciprocating lead screw 20 is driven by the second horizontal shaft 19 and reciprocates. A speed regulating frame 21 is drivingly installed on the first reciprocating lead screw 20. A variable-speed cone 22 is rotatably installed on the speed regulating frame 21. When the variable-speed cone 22 is in use, the servo motor 3 drives the main shaft 17 to rotate through the synchronous belt. The first bevel gear on the main shaft 17 meshes with the first bevel gear on the sub-shaft 18, thereby driving the sub-shaft 18 to rotate. The second bevel gear on the sub-shaft 18 meshes with the second bevel gear on the second horizontal shaft 19, causing the second horizontal shaft 19 to rotate. The rotation of the second horizontal shaft 19 drives the first reciprocating lead screw 20 to reciprocate, and the first reciprocating lead screw 20 drives the speed regulating frame 21 to reciprocate;

[0059] The speed regulating frame 21 reciprocates and then drives the speed-changing cone 22 on the speed regulating frame 21 to change its position reciprocally. After the position of the speed-changing cone 22 changes reciprocally, the speed of the first horizontal shaft 4 is periodically adjusted through the elastic synchronous transmission belt 23.

[0060] A first half-toothed gear 24 is installed on the second transverse axis 19, and a first driven gear 25 is fixedly installed on the first reciprocating screw rod 20. The first half-toothed gear 24 is transmission-connected with the first driven gear 25. A first torsion spring 26 is fixedly provided at the rotation connection between the first reciprocating screw rod 20 and the frame 1. A group of belt limiting rollers are rotatably installed on the frame 1 and at positions corresponding to both sides of the elastic synchronous transmission belt 23. The axis of the belt limiting roller is perpendicular to the axis of the speed change cone 22. A first synchronous groove with openings at both ends and slidingly connected to the second transverse axis 19 is fixedly provided inside the speed change cone 22. The cross-sections of the first synchronous groove and the second transverse axis 19 are both regular hexagons.

[0061] The first half-toothed gear 24 on the second transverse shaft 19 is in transmission connection with the first driven gear 25 on the first reciprocating screw 20. When the first half-toothed gear 24 rotates, it meshes with the first driven gear 25 once every half turn, driving the first reciprocating screw 20 to rotate intermittently. With the reset effect of the first torsion spring 26, the first reciprocating screw 20 can rotate back and forth smoothly. The belt limiting roller limits the elastic synchronous transmission belt 23 to prevent it from shifting during the transmission process. The regular hexagonal design of the first synchronous groove and the second transverse shaft 19 ensures a stable transmission connection between the second transverse shaft 19 and the speed change cone 22.

[0062] This structure solves the problems of unstable screw movement and easy deviation of the belt during transmission, ensures the stable operation of the variable speed transmission system, and further ensures the reliability of the speed adjustment of the first horizontal axis 4. Compared with the existing technology, it improves the stability of equipment operation and service life.

[0063] The linkage module includes a guide inclined plate 37 and a second reciprocating screw rod 38 rotatably connected to the frame 1, a second torsion spring 39 is fixedly arranged at the rotation connection between the second reciprocating screw rod 38 and the frame 1, a second driven gear 27 is fixedly installed on the second reciprocating screw rod 38, a second half-toothed gear 28 is fixedly installed on the first transverse shaft 4, the second half-toothed gear 28 is transmission-connected with the second driven gear 27, a stroke adjustment frame 29 is transmission-installed on the second reciprocating screw rod 38, and the semi-cone transmission body 5 is rotationally installed On the stroke adjustment frame 29, a second synchronization groove with openings at both ends and slidably connected to the first transverse axis 4 is fixedly opened inside the semi-conical transmission body 5. The cross-sections of the second synchronization groove and the first transverse axis 4 are both regular hexagons. A group of elastic pressing members 30 are installed between the guide inclined plate 37 and the vibration mixing frame 6. The inclined surface of the guide inclined plate 37 fits the inclined surface of the semi-conical transmission body 5. A plurality of elastic reset members 40 are installed between the vibration mixing frame 6 and the reaction shell 2. Friction patterns are provided on the guide inclined plate 37 and the semi-conical transmission body 5.

[0064] When in use, the first horizontal axis 4 rotates to drive the second half-tooth gear 28 to rotate, and the second half-tooth gear 28 is connected to the second driven gear 27 to drive the second reciprocating screw 38 to rotate. The second reciprocating screw 38 drives the stroke adjustment frame 29 to move, so that the semi-conical transmission body 5 moves back and forth within the set stroke. When the semi-conical transmission body 5 rotates and moves back and forth, its inclined surface fits with the inclined surface of the guide inclined plate 37, and power is transmitted through the friction texture. Under the action of the elastic clamping piece 30, the vibration mixing frame 6 is driven to move back and forth. This structure solves the problem of complex or unstable driving mode of the vibration mixing frame 6 in the existing device, can accurately control the reciprocating movement of the vibration mixing frame 6, and enhance the mixing effect of the material during the vibration mixing process. Compared with the traditional device, the uniformity of material mixing is improved, which helps to improve the quality of nylon powder.

[0065] The radius of the first half-toothed gear 24 is 7 times the radius of the first driven gear 25 , and the radius of the second half-toothed gear 28 is 8 times the radius of the second driven gear 27 .

[0066] When in use, the appropriate radius ratio of the half-tooth gear and the driven gear can adjust the rotation speed and stroke of the first and second reciprocating screws. The radius ratio of the first half-tooth gear 24 and the first driven gear 25 enables the first reciprocating screw 20 to drive the speed regulating frame 21 to move at an appropriate speed and stroke during the rotation of the second horizontal axis 19, and accurately adjust the rotation speed of the first horizontal axis 4. The radius ratio of the second half-tooth gear 28 and the second driven gear 27 ensures that the second reciprocating screw 38 can stably drive the stroke adjusting frame 29, thereby controlling the reciprocating displacement of the semi-conical transmission body 5 and the vibration mixing frame 6. This design solves the problem of uncoordinated equipment operation caused by unreasonable transmission ratio, optimizes the overall operation performance of the equipment, improves the transmission efficiency and operation accuracy of the equipment compared to the prior art, and ensures the stability of the nylon powder preparation process.

[0067] A third synchronization groove with an opening at the rear end and slidably connected to the fixed mixing shaft 9 is fixedly provided inside the dynamic mixing shaft 10 . The cross sections of the third synchronization groove and the fixed mixing shaft 9 are both regular hexagons.

[0068] The third synchronous groove inside the dynamic mixing shaft 10 cooperates with the regular hexagonal cross-section of the fixed mixing shaft 9, so that the dynamic mixing shaft 10 can not only stably transmit on the fixed mixing shaft 9, but also move back and forth along the axial direction of the fixed mixing shaft 9 under the drive of the pulse inflation mechanism. In the preparation process of nylon powder, the stirring paddle 11 can stir the material more comprehensively with the back and forth movement of the dynamic mixing shaft 10, avoiding the occurrence of mixing dead corners, solving the problem of uneven material mixing in traditional mixing methods. Compared with the existing technology, the mixing uniformity of the material is significantly improved, and the quality of the nylon powder is improved.

[0069] An internal fixed part of the vibration mixing shaft 8 is provided with a fourth synchronous groove that is open at the tail end and slidably connected to the main shaft 17. The cross-sections of both the fourth synchronous groove and the main shaft 17 are regular hexagons. An anti-rotation shaft 31 is rotatably installed on the vibration mixing frame 6. Side bevel gears are installed on both the rotation and displacement frame 7 and the vibration mixing shaft 8. An anti-rotation bevel gear is installed on the anti-rotation shaft 31. Both of the two anti-rotation bevel gears are in transmission connection with the side bevel gears, and the two side bevel gears are respectively arranged on both sides of the anti-rotation bevel gear.

[0070] The fourth synchronous groove inside the vibration mixing shaft 8 is matched with the regular hexagonal cross-section of the main shaft 17, ensuring that the vibration mixing shaft 8 can stably obtain power from the main shaft 17. The anti-rotation bevel gear on the anti-rotation shaft 31 is in transmission connection with the side bevel gears on the rotation and displacement frame 7 and the vibration mixing shaft 8, causing the rotation and displacement frame 7 and the vibration mixing shaft 8 to rotate coaxially in opposite directions. When preparing nylon powder, this structure of reverse rotation increases the tumbling effect of the material, enabling the material to be subjected to stirring forces in different directions, further improving the uniformity of material mixing, solving the problem of single stirring direction in the existing device, greatly improving the quality of material mixing compared with the traditional stirring method, and being conducive to preparing high-performance nylon powder.

[0071] The pulse inflation mechanism includes a pump cylinder 32 installed on the back of the reaction shell 2. A set of pump blades 33 is installed at the output end of the servo motor 3 and corresponding to the inner side of the pump cylinder 32. The air inlet port of the pump cylinder 32 is communicated with a filter element. First flow channels are opened on both the main shaft 17 and the vibration mixing shaft 8. A second flow channel is fixedly opened inside the fixed mixing shaft 9. An air chamber is provided between the fixed mixing shaft 9 and the moving mixing shaft 10. A T-shaped beam rod 35 that is fixedly installed on the fixed mixing shaft 9 and slidably connected to the moving mixing shaft 10 is sleeved with a return spring 34 limited by the moving mixing shaft 10. The air outlet port of the pump cylinder 32 is communicated with the first flow channel through a pipeline. The first flow channel is communicated with the air chamber through the second flow channel. A pulse pressure relief valve 36 is installed in the pipeline.

[0072] During use, the servo motor 3 drives the pump blades 33 to rotate. The pump blades 33 suck air through the filter element into the pump cylinder 32. After the filtered air enters the pump cylinder 32, it sequentially flows through the first flow channels of the main shaft 17 and the vibration mixing shaft 8 and the second flow channel of the fixed mixing shaft 9 through the pipeline and enters the air chamber between the moving mixing shaft 10 and the fixed mixing shaft 9. As the air pressure in the air chamber increases, the moving mixing shaft 10 moves along the axis direction of the fixed mixing shaft 9 under the action of the air pressure, overcoming the elastic force of the return spring 34. When the air pressure reaches the set value of the pulse pressure relief valve 36, the valve opens to relieve pressure, and the moving mixing shaft 10 returns to its original position under the action of the return spring 34. In this way, the reciprocating displacement of the moving mixing shaft 10 is realized. During this process, the stirring paddle 11 continuously changes the stirring position under the drive of the moving mixing shaft 10, enhancing the stirring effect. This mechanism solves the problems of single power and poor stirring effect in the traditional stirring method. By driving the reciprocating displacement of the moving mixing shaft 10 through pulse inflation, the material is stirred more fully, improving the mixing efficiency and quality of the material during the preparation of nylon powder compared with the existing technology.

[0073] A preparation method of a high-performance 3D printing nylon powder, comprising the following steps:

[0074] SS01, nylon modification: Place the nylon base material in a mixer, and spray and add an auxiliary agent made by dissolving a surfactant, a light absorber, a compatibilizer, a viscosity reducer, an antioxidant, and a thermal conductive powder in an organic solvent thereto. After fully stirring and drying evenly with the mixer, a modified nylon base material is obtained;

[0075] SS02, melting and emulsifying: Add the modified nylon base material, solvent oil, and emulsifier to the reaction shell 2 of the preparation device. Turn on the servo motor 3. The servo motor 3 drives the variable speed transmission system. The servo motor 3 drives the main shaft 17 to rotate through a synchronous belt. The main shaft 17 drives the auxiliary shaft 18 through a first bevel gear. The auxiliary shaft 18 then drives the second horizontal shaft 19 through a second bevel gear. The second horizontal shaft 19 drives the first reciprocating lead screw 20 to reciprocally rotate, causing the speed regulating frame 21 to move and changing the position of the variable speed cone 22. The speed of the first horizontal shaft 4 is periodically adjusted through an elastic synchronous belt 23. The speed of the first horizontal shaft 4 changes periodically, driving the dynamic mixing system installed thereon to stir the material. At the same time, the temperature in the reaction shell 2 rises to 250 °C under the action of the heating jacket 13, melting the modified nylon base material into a liquid;

[0076] SS03, stirring and emulsifying process: Driven by the first horizontal shaft 4, the vibration mixing shaft 8 rotates. The fourth synchronous groove inside it cooperates with the main shaft 17 to stably obtain power. The reverse transmission bevel gear on the reverse transmission shaft 31 is in transmission with the side bevel gears on the rotation displacement frame 7 and the vibration mixing shaft 8, causing the rotation displacement frame 7 and the vibration mixing shaft 8 to rotate coaxially and in opposite directions. The driving bevel gear on the vibration mixing shaft 8 drives the driven bevel gear of the dynamic mixing system, causing the fixed mixing shaft 9 to rotate. The dynamic mixing shaft 10 sleeved on the fixed mixing shaft 9 through a transmission rotates accordingly. The stirring paddle 11 on the dynamic mixing shaft 10 stirs the material. The pulse inflation mechanism works. The servo motor 3 drives the pump impeller 33 to rotate. Air is inhaled into the pump cylinder 32 through a filter element and enters the pneumatic chamber between the dynamic mixing shaft 10 and the fixed mixing shaft 9 through a pipeline. When the air pressure rises, the dynamic mixing shaft 10 moves along the axis direction of the fixed mixing shaft 9 against the elastic force of the return spring 34. When the air pressure reaches the set value of the pulse pressure relief valve 36, pressure relief occurs, and the dynamic mixing shaft 10 returns to its original position under the action of the return spring 34, driving the stirring paddle 11 to continuously change the stirring position;

[0077] SS04, solidification and screening: After the nylon high-temperature emulsion is discharged from the reaction shell 2, it is quickly cooled to form a nylon suspension. The nylon suspension is subjected to solid-liquid separation by a solid-liquid separation device, and then washed and dried to obtain spherical nylon powder. Then, nylon powder with a particle size of 30 - 100 μm for 3D printing is screened out through a grading and screening device.

[0078] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for preparing high-performance 3D printing nylon powder, comprising a frame (1) and a reaction shell (2) connected to each other, characterized in that: It also comprises a vibrating and mixing frame (6), the frame (1) is respectively provided with a servo motor (3) and a variable speed transmission system driven by the servo motor (3), the variable speed transmission system is connected to a first transverse shaft (4) with a periodically variable rotation speed, the frame (1) is provided with a linkage module driven by the first transverse shaft (4), the linkage module is connected to a semi-conical transmission body (5) which is rotatable and can be reciprocated within a set stroke, the vibrating and mixing frame (6) is driven and reciprocated by the linkage module, the reciprocating stroke of the vibrating and mixing frame (6) is adjusted by the linkage module, a rotating frame (7) is rotatably mounted on the inner wall of the vibrating and mixing frame (6), a vibrating and mixing shaft (8) is rotatably mounted on the inner wall of the rotating frame (7), the rotating frame (7) and the vibrating and mixing shaft (8) rotate in opposite directions coaxially, the vibrating and mixing shaft (8) is provided with an active bevel gear, and a group of dynamic mixing systems is provided on the rotating frame (7); The dynamic mixing system comprises a fixed mixing shaft (9) rotatably connected to a rotating frame (7); a driven bevel gear meshing with a driving bevel gear is fixedly mounted on the tail end of the fixed mixing shaft (9); a dynamic mixing shaft (10) is provided on a transmission sleeve on the fixed mixing shaft (9); a plurality of groups of stirring paddles (11) are mounted on the dynamic mixing shaft (10); a pulse inflation mechanism is mounted on the frame (1); and the dynamic mixing shaft (10) is driven by the pulse inflation mechanism and is reciprocated along the axial direction of the fixed mixing shaft (9).

2. A device for preparing high-performance 3D printing nylon powder according to claim 1, characterized in that: A material valve (12) communicating with the inner cavity of the reaction shell (2) is installed at the top and bottom of the reaction shell (2); a heating jacket (13) is installed on the reaction shell (2); a pressure probe (14) for monitoring the inner cavity pressure of the reaction shell (2) and a temperature probe (15) for monitoring the inner cavity temperature of the reaction shell (2) are installed at the top of the reaction shell (2); a single-chip computer (16) is installed at the end surface of the reaction shell (2); and data ends of the temperature probe (15) and the pressure probe (14) are both data-connected to the single-chip computer (16).

3. The device for preparing high-performance 3D printing nylon powder according to claim 1, characterized in that: The speed transmission system comprises a main shaft (17), a secondary shaft (18) and a second transverse shaft (19) which are rotatably connected to the frame (1); a synchronous belt is connected between the output end of the servo motor (3) and the main shaft (17); first bevel gears are mounted on the main shaft (17) and the secondary shaft (18); the two first bevel gears are meshed with each other; second bevel gears are mounted on the secondary shaft (18) and the second transverse shaft (19); the two second bevel gears are meshed with each other; a first reciprocating screw (20) is rotatably mounted on the frame (1); the first reciprocating screw (20) is driven and reciprocates through the second transverse shaft (19); a speed regulating frame (21) is transmission-mounted on the first reciprocating screw (20); a speed-changing cone (22) is rotatably mounted on the speed regulating frame (21); an elastic synchronous transmission belt (23) is transmission-connected between the speed-changing cone (22) and the first transverse shaft (4).

4. The device for preparing high-performance 3D printing nylon powder according to claim 3, characterized in that: A first half-toothed gear (24) is mounted on the second transverse axis (19), a first driven gear (25) is fixedly mounted on the first reciprocating screw (20), the first half-toothed gear (24) is transmission-connected to the first driven gear (25), a first torsion spring (26) is fixedly arranged at the rotation connection between the first reciprocating screw (20) and the frame (1), a group of belt limiting rollers are rotationally mounted on the frame (1) and at positions corresponding to both sides of the elastic synchronous transmission belt (23), the axis of the belt limiting rollers is perpendicular to the axis of the speed change cone (22), a first synchronization groove with openings at both ends fixedly opened inside the speed change cone (22) and slidably connected to the second transverse axis (19), the cross-sections of the first synchronization groove and the second transverse axis (19) are both regular hexagons.

5. The device for preparing high-performance 3D printing nylon powder according to claim 4, characterized in that: The linkage module comprises a guide inclined plate (37) and a second reciprocating screw (38) rotatably connected to the frame (1); a second torsion spring (39) is fixedly arranged at the rotation connection between the second reciprocating screw (38) and the frame (1); a second driven gear (27) is fixedly mounted on the second reciprocating screw (38); a second half-toothed gear (28) is fixedly mounted on the first transverse shaft (4); the second half-toothed gear (28) is transmission-connected to the second driven gear (27); a stroke adjustment frame (27) is transmission-mounted on the second reciprocating screw (38); 9), the semi-conical transmission body (5) is rotatably mounted on a stroke adjustment frame (29), a second synchronous groove with two ends opened and slidably connected to the first transverse axis (4) is fixedly opened inside the semi-conical transmission body (5), the cross-sections of the second synchronous groove and the first transverse axis (4) are both regular hexagons, a group of elastic pressing members (30) are installed between the guide inclined plate (37) and the vibration mixing frame (6), the inclined surface of the guide inclined plate (37) is in contact with the inclined surface of the semi-conical transmission body (5), and a plurality of elastic reset members (40) are installed between the vibration mixing frame (6) and the reaction shell (2).

6. The device for preparing high-performance 3D printing nylon powder according to claim 5, characterized in that: The radius of the first half-toothed gear (24) is 5 to 8 times the radius of the first driven gear (25), the radius of the second half-toothed gear (28) is 5 to 8 times the radius of the second driven gear (27), and friction patterns are provided on the guide inclined plate (37) and the semi-conical transmission body (5).

7. The device for preparing high-performance 3D printing nylon powder according to claim 1, characterized in that: A third synchronization groove with an opening at the rear end and slidably connected to the fixed mixing shaft (9) is fixedly provided inside the dynamic mixing shaft (10), and the cross sections of the third synchronization groove and the fixed mixing shaft (9) are both regular hexagonal.

8. The device for preparing high-performance 3D printing nylon powder according to claim 1, characterized in that: A fourth synchronous groove with a tail end opening and slidably connected to the main shaft (17) is fixedly provided inside the vibration and mixing shaft (8); the cross sections of the fourth synchronous groove and the main shaft (17) are both regular hexagons; a reverse transmission shaft (31) is rotatably mounted on the vibration and mixing frame (6); a side bevel gear is mounted on the rotation frame (7) and the vibration and mixing shaft (8); a reverse transmission bevel gear is mounted on the reverse transmission shaft (31); the two reverse transmission bevel gears are both transmission-connected to the side bevel gears; and the two side bevel gears are respectively arranged on both sides of the reverse transmission bevel gear.

9. The device for preparing high-performance 3D printing nylon powder according to claim 3, characterized in that: The pulse inflation mechanism comprises a pump barrel (32) mounted on the back of the reaction shell (2); a group of pump blades (33) are mounted at the output end of the servo motor (3) and at a position corresponding to the inner side of the pump barrel (32); an air inlet port of the pump barrel (32) is connected to a filter element; a first flow channel is provided on the main shaft (17) and the vibrating mixing shaft (8); a second flow channel is fixedly provided inside the fixed mixing shaft (9); a pneumatic chamber is provided between the fixed mixing shaft (9) and the dynamic mixing shaft (10); a T-shaped tie rod (35) slidably connected to the dynamic mixing shaft (10) is fixedly mounted on the fixed mixing shaft (9); a return spring (34) limited by the dynamic mixing shaft (10) is sleeved on the T-shaped tie rod (35); an air outlet port of the pump barrel (32) is connected to the first flow channel through a pipeline; the first flow channel is connected to the pneumatic chamber through the second flow channel; and a pulse pressure relief valve (36) is installed in the pipeline.

10. The method for preparing high-performance 3D printing nylon powder according to claim 9, characterized in that: The following steps are involved: SS01, nylon modification, placing the nylon base material in a mixer, spraying and adding an additive prepared by dissolving a surfactant, a light absorber, a compatibilizer, a viscosity reducer, an antioxidant and a thermal conductive powder in an organic solvent, fully stirring and drying the mixture in a mixer to obtain a modified nylon base material; SS02, melt emulsification, add the modified nylon base material, solvent oil and emulsifier into the reaction shell (2) of the preparation device, turn on the servo motor (3), the servo motor (3) drives the speed change transmission system, the servo motor (3) drives the main shaft (17) to rotate through the synchronous belt, the main shaft (17) drives the secondary shaft (18) through the first bevel gear, the secondary shaft (18) drives the second horizontal shaft (19) through the second bevel gear, the second horizontal shaft (19) drives the first reciprocating screw (20) to reciprocate, so that the speed regulating frame (21) moves, the position of the speed change cone (22) is changed, the speed of the first horizontal shaft (4) is periodically adjusted through the elastic synchronous transmission belt (23), the speed of the first horizontal shaft (4) changes periodically, and drives the dynamic mixing system installed thereon to stir the material, at the same time, the temperature in the reaction shell (2) is raised to 180°C-260°C under the action of the heating jacket (13), so that the modified nylon base material is dissolved into liquid; SS03, stirring and emulsifying process, driven by the first horizontal shaft (4), the vibrating and mixing shaft (8) rotates, and the fourth synchronous groove inside the vibrating and mixing shaft (8) cooperates with the main shaft (17) to stably obtain power, and the reverse transmission bevel gear on the reverse transmission shaft (31) is driven by the side bevel gears on the rotation frame (7) and the vibrating and mixing shaft (8), so that the rotation frame (7) and the vibrating and mixing shaft (8) rotate coaxially and in opposite directions, and the active bevel gear on the vibrating and mixing shaft (8) drives the driven bevel gear of the dynamic mixing system, so that the fixed mixing shaft (9) rotates, and the dynamic mixing shaft (10) provided with a transmission sleeve on the fixed mixing shaft (9) rotates accordingly, and the dynamic mixing shaft (10) The stirring paddle (11) on the mixing machine stirs the material, the pulse air charging mechanism works, the servo motor (3) drives the pump blade (33) to rotate, the air is sucked into the pump barrel (32) through the filter element, and enters the pneumatic chamber between the dynamic mixing shaft (10) and the fixed mixing shaft (9) through the pipeline. When the air pressure increases, the dynamic mixing shaft (10) overcomes the elastic force of the return spring (34) and moves along the axis of the fixed mixing shaft (9). When the air pressure reaches the set value of the pulse pressure relief valve (36), the pressure is released, and the dynamic mixing shaft (10) is reset under the action of the return spring (34), driving the stirring paddle (11) to continuously change the stirring position; SS04, solidification and screening, after the nylon high temperature emulsion is discharged from the reaction shell (2), it is quickly cooled to form a nylon suspension, the nylon suspension is subjected to solid-liquid separation using a solid-liquid separation device, and then washed and dried to obtain spherical nylon powder, and then 30-100 μm nylon powder for 3D printing is screened out using a grading and screening device.

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