A nozzle embedded type 3D printing device for thermosetting wood plastic composite

Abstract

A nozzle embedded type 3D printing equipment for thermosetting wood plastic composite material belongs to the technical field of 3D printing, and the printing equipment comprises a rack and an extrusion movement mechanism, a powder laying mechanism, a powder bed mechanism, a printing platform movement mechanism and a binder feeding system provided on the rack, and the extrusion movement mechanism is fed by the feeding system. The present application can improve the printing efficiency of the existing printing equipment, reduce the manufacturing and maintenance cost of the existing equipment, ensure the accuracy and consistency of the printing structure, realize the printing of high-precision complex structure, and provide the equipment combining the advantages of the extrusion type printing equipment and the powder bed structure. The requirements of single extrusion printing on the formability of the extruded material are solved, the shape and precision of large flow, high viscosity and large layer thickness printing are realized, the types of binder materials suitable for the equipment are rich, the types and size range of the powder bed materials are large, and the rapid forming processing requirements of parts with wide material application, large forming size and high part strength are met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of 3D printing, and relates to a wood-plastic composite material 3D printing device, in particular to a nozzle-buried 3D printing device for thermosetting wood-plastic composite materials. BACKGROUND

[0002] The existing wood-plastic composite material 3D printing device mainly includes three types: a fused deposition device, a selective laser sintering device and a binder jetting device. When the fused deposition device works, processes such as heating the nozzle to melt the material and keeping the printing bed temperature to promote the adhesion of the material are included, which reduces the printing speed. And the model slicing data of this kind of device contains a lot of filling information and support structure data, which seriously reduces the printing efficiency. The selective laser sintering device uses a powder laying device to lay powder material on the workbench, and then uses the heat of the laser beam to sinter and melt the powder in the target area, layer by layer bonding and stacking, without support structure, which improves the printing efficiency to a certain extent. However, the high manufacturing and maintenance costs of the device are caused by the high precision of the parts, and the wood-plastic composite material has high requirements for the temperature and laser power control of the device. The binder jetting device does not require a laser system, reducing the manufacturing and maintenance costs of the device. However, in the process of high-speed and large-flux printing, the impact of droplets on the powder bed causes the powder to splash, which easily leaves gaps inside the powder bed, further increasing the porosity of the printed parts, and the irregular flow of liquid in the powder bed gaps makes it difficult to achieve high-precision and complex structure printing.

[0003] Therefore, in order to solve the problems of low printing efficiency, low printing precision and high manufacturing and maintenance costs of the existing printing device, a nozzle-buried 3D printing device suitable for wood-plastic composite powder (granules) is designed based on the principle of in-situ impregnation, which reduces the phenomenon of powder splashing, reduces the number of high-cost components, realizes the rapid printing forming of thermosetting wood-plastic composite materials with large flux, and has the ability to realize the whole process from material stacking to forming, promoting the sustainable development and industrial application of wood-plastic composite material 3D printing technology. SUMMARY

[0004] In order to overcome the problems of the existing wood-plastic composite material 3D printing device, such as low printing efficiency, low printing precision, high manufacturing and maintenance costs of the device, etc. The present application designs a nozzle-buried 3D printing device, in which the nozzle is buried in the powder bed mechanism filled with wood-plastic composite material, moves according to the designed path and injects the binder, and the binder penetrates into the pores inside the printed part to make the wood-plastic composite material adhere, realizing the preliminary solidification and forming of the material at room temperature, and completing the 3D printing of the wood-plastic composite material. Through appropriate post-processing process, the mechanical properties of the printed part are improved.

[0005] In order to achieve the purpose of the present application, the technical scheme adopted by the present application is:

[0006] A nozzle embedded type 3D printing device for thermosetting wood plastic composite material, the nozzle embedded type 3D printing device includes frame, extrusion movement mechanism, powder laying mechanism, powder bed mechanism, printing platform movement mechanism and binder supply system, the frame is provided with extrusion movement mechanism, powder laying mechanism, powder bed mechanism and printing platform movement mechanism. Specifically:

[0007] The extrusion movement mechanism includes synchronous belt module guide rail I 1, synchronous belt module guide rail II 3, synchronous belt module guide rail III 6, synchronous belt module guide rail IV 10, sliding block 2, nozzle 4, servo motor I 5, servo motor II 7, servo motor III 9, transmission shaft I 8 and motor cage 23. Specifically: the synchronous belt module guide rail I 1 and the synchronous belt module guide rail IV are installed in parallel on the left and right sides of the top end of the frame, the sliding blocks on the two synchronous belt module guide rails I 1 are upward, a transmission shaft I 8 is used to connect the power shafts of the two synchronous belt module guide rails I 1, the servo motor III 9 is installed above the right synchronous belt module guide rail I 1 in cooperation with the motor cage 23, and power is provided for the sliding block 2 of the right synchronous belt module guide rail I 1 to move in the front-rear direction. A synchronous belt module guide rail II 3 is installed above the two sliding blocks of the synchronous belt module guide rail I 1, the sliding block of the synchronous belt module guide rail II 3 is forward, the servo motor II 7 is installed on the right side of the synchronous belt module guide rail II 3 in cooperation with the motor cage 23, and power is provided for the sliding block to move in the left-right direction. A synchronous belt module guide rail III 6 is vertically installed on the sliding block of the synchronous belt module guide rail II 3, the servo motor I 5 is installed at the top end of the synchronous belt module guide rail III 6, and power is provided for the sliding block to move in the vertical direction. The nozzle 4 is installed above the sliding block of the synchronous belt module guide rail III 6, so as to cooperate with the printing platform 29 to move up and down, that is, to realize the three-axis movement of the nozzle 4 on the frame, and to realize the printing process according to the specified path.

[0008] Further, the sliding block 2 of the two synchronous belt module guide rails I 1 is provided with a bracket 22 for installing the synchronous belt module guide rail II 3.

[0009] The powder laying mechanism includes a connecting plate 11, a synchronous belt module V 12, a powder bin 13, a hopper 37, a synchronous belt module VI 14, a scraper 35 and a servo motor V 36. The synchronous belt module guide rails V 12 and VI 14 are horizontally installed on the rear side of the frame, the sliding blocks are forward, a connecting plate 11 is installed on the two sliding blocks to synchronize the movement, and the connecting plate 11 helps the powder bin 13 to resist the bending moment; the servo motor V 36 is installed on the rear side of the connecting plate 11 to provide power for the sliding block movement. The powder bin 13 is installed on the connecting plate 11, and the hopper 37 and the scraper 35 are stacked thereon. The scraper 35 is installed below the hopper 37, and is used to scrape the filled powder on the printing plane, that is, to lay a layer of powder on the printing platform 29 during the movement of the powder bin 13, and to flatten the powder by the scraper 35.

[0010] The powder bed mechanism includes positioning pin 16, aluminum plate 24, positioning pin rack 27, powder bed positioning rack 28 and printing platform 29. The outer wall of the powder bed mechanism is composed of four aluminum plates 24, and the bottom surface of the powder bed mechanism is a movable printing platform 29. The powder bed mechanism is installed with rollers at the bottom, which is pushed into the working position, and the positioning pin rack 27 at the rear side of the powder bed mechanism and the powder bed positioning rack 28 are connected by using the positioning pin 26, and the positioning of the powder bed mechanism is completed. The powder bed mechanism is installed with electromagnet 30 at the bottom, which is energized with the electromagnet installed on the lifting platform 29 to complete the adsorption, and then the two lock buckles at the front side of the powder bed mechanism are locked for the fixation of the powder bed mechanism.

[0011] Further, in the powder bed mechanism: the two adjacent aluminum plates 24 in the outer wall of the powder bed mechanism are fixed by inner corner aluminum 25 and outer corner aluminum 15; the printing platform 29 is installed with felt between the outer wall of the powder bed mechanism to prevent powder leakage; a plurality of pulleys 21 are installed on the aluminum profiles on both sides of the powder bed mechanism, facilitating the installation and disassembly of the powder bed mechanism before and after printing; lock buckles 20 are installed between the aluminum plates 24 and the gaps of the aluminum profiles at the front side of the powder bed mechanism for the fixation of the powder bed mechanism.

[0012] The printing platform movement mechanism includes servo motor IV 32, ball screw 18, transmission shaft II 19, transmission belt, lifting platform 34, electromagnet 30 and electromagnet mounting platform 28. The servo motor IV 32 rotates, and the power is transmitted to the two side pulleys 17 through the transmission belt, which provides power for the ball screw 18, and then drives the printing platform 29 to move vertically on the ball screw, and the layer-by-layer stacking of the printing model is realized through the lifting platform 34. The four ball screws 18 are vertically installed on the four aluminum profiles, and the lifting platform 34 is horizontally installed at the top end, and the four electromagnets 30 are installed around the lifting platform 34, which fixes the printing platform 29 on the lifting platform 34 when the electromagnets are energized. The servo motor IV 32 is installed on the aluminum profile between the two ball screws 18.

[0013] Further, in the printing platform movement mechanism, the tightness of the transmission belt is adjusted by the tensioning pulley 33 to prevent the failure of the belt drive.

[0014] The adhesive feeding system comprises a dispensing pressure tank A, a dispensing pressure tank B, a cleaning tank, a gear pump A, a gear pump B, a three-way ball valve, a direct current motor and a dynamic mixing pipe. The gas source outlet is connected to the gas inlets of the dispensing pressure tanks A and B through pipelines to add gas into the dispensing pressure tanks A and B, and to maintain the pressure of the A glue in the dispensing pressure tank A and the B glue in the dispensing pressure tank B, so as to improve the rheological property of the glue, and to improve the adhesion and bonding strength thereof. The gas source outlet is connected to the gas inlet of the cleaning tank through a pipeline to add gas into the cleaning tank to press out the cleaning agent. The liquid outlet of the dispensing pressure tank A is connected to the inlet of the gear pump A through a pipeline, and the liquid outlet of the dispensing pressure tank B is connected to the inlet of the gear pump B, so that the amount and ratio of the A glue and the B glue can be accurately controlled through the control of the gear pumps by the servo motor. The controllable flow direction pipelines are connected by using the three-way ball valves, the outlets of the gear pumps A and B are respectively connected to one valve port of two three-way ball valves, one valve port of each of the two three-way ball valves is installed on a flow divider, and one valve port of each of the two three-way ball valves is connected to the dynamic mixing pipe. The liquid outlet of the cleaning tank is connected to a three-way, and the other two outlets of the three-way are connected to the flow divider through pipelines to pressurize and deliver the cleaning agent into the pipelines, and the two pipelines can increase the flow of the cleaning agent. A direct current motor is installed at the top end of the flow divider and connected to the auger in the dynamic mixing pipe through a coupling. The inlet of the dynamic mixing pipe is installed at the lower end of the flow divider and used to mix the A glue and the B glue into adhesive. When the valves of the A glue and the B glue are opened and the valve of the cleaning tank is closed, the A glue and the B glue enter the dynamic mixing pipe, the outlet of the dynamic mixing pipe is connected to a nozzle, and the direct current motor drives the auger to rotate to improve the uniformity of the adhesive mixing. When the valves of the A glue and the B glue are closed and the valve of the cleaning tank is opened, the cleaning agent is sprayed out of the pipeline to achieve the effect of cleaning the pipeline and the dynamic mixing pipe. The direct current motor is turned on during cleaning to improve the cleaning effect. The outlet of the dynamic mixing pipe is connected to the inlet of the nozzle 4 through a pipeline to deliver the adhesive to the nozzle 4, and the nozzle 4 extrudes the adhesive to realize printing.

[0015] A method for using a nozzle-buried 3D printing device for thermosetting wood-plastic composites, comprising the following steps:

[0016] Firstly, the printing plane 29 is adjusted to zero, the powder bed mechanism is pushed into the designated position along the pulley 21, then the positioning pin 16 is inserted through the holes of the positioning pin frame 27 and the powder bed positioning frame 28, the lock buckle 20 is locked, the electromagnet 30 is powered on, the printing plane 29 is adsorbed on the lifting plane 34, and the positioning of the powder bed mechanism is completed; then the model slices made according to computer-aided design are input into the PC control terminal, the host computer software sends instructions to the PLC through the control terminal; then the motion controller controls the servo motor I 5, the servo motor II 7, the servo motor III 9, the servo motor IV 32 and the servo motor V 36 to perform three-dimensional spatial motion through the extrusion motion mechanism and the printing platform motion mechanism.

[0017] Secondly, the air source is added to the glue dispensing pressure tank A and the glue dispensing pressure tank B to keep the pressure of the A glue and the B glue. When the A glue and the B glue valves are opened and the cleaning tank valve is closed, the gear pump is used to pump the A glue and the B glue into the dynamic mixing pipe, the direct current motor drives the auger to rotate to improve the uniformity of the adhesive mixing, and the dynamic mixing pipe outlet is connected with the nozzle 4 to extrude the adhesive.

[0018] Thirdly, the nozzle 4 extrudes the material while the extrusion movement mechanism moves to drive the nozzle 4 to move, the powder flows out of the powder bin 13 gap to the printing plane 29 while the powder bin 13 moves, and the powder is flattened under the action of the scraper 35, so that the material is stacked in the process of continuous movement and injection; then after a long time of printing, the part printing is completed. The electromagnet 30 is powered off, the positioning pin 16 is taken out, the lock catch 20 is opened, the powder bed mechanism is taken out, and the printed part is taken out for post-processing.

[0019] Finally, the A glue and the B glue valves are closed, the cleaning tank valve is opened, the cleaning agent is sprayed out of the pipeline to achieve the effect of cleaning the pipeline and the dynamic mixing pipe, and the direct current motor is started to improve the cleaning effect.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows:

[0021] (1) The device provided by the present application solves the problems of low printing efficiency of the existing wood-plastic composite material printing device and high manufacturing and maintenance cost of the laser sintering device, has the full-process implementation capability from material stacking to forming, and reduces powder splashing in the printing process.

[0022] (2) In the 3D printing process of the present application, the embedded printing nozzle is embedded below the printing powder bed plane by a certain depth and extrudes the liquid adhesive, forms a water channel with a certain depth and width on the powder bed surface, simultaneously fills the dynamic water channel with a large flow of liquid adhesive, and then the liquid adhesive penetrates, diffuses and solidifies in a controlled and constrained state to form a printed entity, which ensures the accuracy and consistency of the printed structure and realizes the printing of high-precision complex structures.

[0023] (3) The device provided by the present application combines the advantages of the extrusion type printing device and the powder bed structure, solves the requirement of single extrusion printing on the formability of the extruded material, realizes the controllable printing of the shape and precision of large flow, high viscosity and large layer thickness printing, and the device is suitable for a variety of adhesive materials, the types and size range of the powder bed material are large, and meets the requirements of rapid prototyping and processing of parts with wide material application, large forming size and high part strength. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0025] Figure 2 Schematic diagram of the extrusion movement mechanism of the present application;

[0026] Figure 3 Schematic diagram of the powder laying mechanism of the present application;

[0027] Figure 4 Schematic diagram of the powder bed mechanism of the present application Figure I ;

[0028] Figure 5 Schematic diagram of the powder bed mechanism of the present application Figure II ;

[0029] Figure 6 Top view of the powder bed mechanism of the present application;

[0030] Figure 7 Schematic diagram of the lifting mechanism of the present application;

[0031] Figure 8 Schematic diagram of the binder supply system of the present application;

[0032] In the figure: 1 synchronous belt module guide rail I; 2 sliding block; 3 synchronous belt module guide rail II; 4 nozzle; 5 servo motor I; 6 synchronous belt module guide rail III; 7 servo motor II; 8 transmission shaft I; 9 servo motor III; 10 synchronous belt module guide rail IV; 11 connecting plate; 12 synchronous belt module guide rail V; 13 powder bin; 14 synchronous belt module VI; 15 outer corner aluminum; 16 positioning pin; 17 pulley; 18 ball screw; 19 transmission shaft II; 20 lock catch; 21 pulley; 22 support; 23 motor cage; 24 aluminum plate; 25 inner corner aluminum; 26 felt; 27 positioning pin holder; 28 powder bed positioning holder; 29 printing platform; 30 electromagnet; 31 pulley; 32 servo motor IV; 33 tension pulley; 34 lifting platform; 35 scraper; 36 servo motor V; 37 hopper. DETAILED DESCRIPTION

[0033] The present application is further described below in conjunction with the accompanying drawings and examples:

[0034] The nozzle embedded type 3D printing equipment for wood-plastic composite material, see Figures 1 to 8 , characterized in that the equipment comprises a rack, an extrusion movement mechanism, a powder laying mechanism, a powder bed mechanism, a printing platform movement mechanism and a binder supply system.

[0035] The rack is connected by bolts.

[0036] The rack is provided with the extrusion movement mechanism, the powder laying mechanism, the powder bed mechanism and the printing platform movement mechanism.

[0037] The extrusion movement mechanism comprises a synchronous belt module guide rail I 1, a sliding block 2, a synchronous belt module guide rail II 3, a nozzle 4, a servo motor I 5, a synchronous belt module guide rail III 6, a servo motor II 7, a transmission shaft I 8, a servo motor III 9, a bracket 22 and a motor cage 23.

[0038] The synchronous belt module guide rail I 1 is installed on the aluminum profile of the rack, the sliding block 2 faces upwards, another synchronous belt module guide rail is installed on the aluminum profile of the rack on the right side of the equipment, and the power shafts of the two synchronous belt module guide rails are connected through the transmission shaft 8, so that the two sliding blocks 2 move synchronously on the synchronous belt module guide rail; the motor cage 23 is installed on the rear end shaft of the right synchronous belt module guide rail, the servo motor is installed above the right synchronous belt module guide rail and is connected with the motor cage through bolts, thereby providing power for the forward and backward movement of the sliding block.

[0039] The bracket 22 is bolted and connected to the sliding block 2, and the same bracket is also installed above the sliding block of the right synchronous belt module for installing the synchronous belt module guide rail II 3, and the sliding block faces forward. The motor cage is installed on the right end shaft of the synchronous belt module guide rail II 3, the servo motor is installed below the right synchronous belt module guide rail, and is connected with the motor cage through bolts, thereby providing power for the left and right movement of the sliding block.

[0040] The synchronous belt module guide rail III 6 is installed vertically on the sliding block of the synchronous belt module guide rail II 3, and the servo motor I 5 is installed on the upper end of the synchronous belt module guide rail III 6 to provide power for the up and down movement of the sliding block.

[0041] The nozzle 4 is installed on the sliding block of the synchronous belt module guide rail III 6, so as to cooperate with the up and down movement of the printing platform 29 to realize the layer-by-layer stacking of the printed model.

[0042] The powder bed mechanism comprises outer corner aluminum 15, positioning pin 16, lock catch 20, pulley 21, aluminum plate 24, inner corner aluminum 25, felt 26, positioning pin bracket 27, powder bed positioning bracket 28 and printing platform 29.

[0043] Four aluminum plates 24 are fixed through the outer corner aluminum 15 to form the outer wall of the powder bed mechanism; the printing platform 29 which can move up and down serves as the bottom surface of the powder bed mechanism; the felt 24 is installed between the printing platform 29 and the outer wall of the powder bed mechanism to prevent powder leakage from the gap; four inner corner aluminums 25 are installed on the inner side of the powder bed mechanism to prevent poor sealing of the felt at the corner and powder leakage at the corner. The powder bed mechanism is provided with a plurality of pulleys 21 installed on the aluminum profiles on both sides of the powder bed mechanism, which facilitates the installation and disassembly of the powder bed mechanism before and after printing; two powder bed positioning brackets 28 are installed on the rear side of the powder bed mechanism, and two positioning pin brackets 27 are installed on the corresponding positions of the rear aluminum profiles, when the powder bed mechanism is installed to the specified position, the positioning pin 16 is inserted into the holes of the positioning pin bracket 27 and the powder bed positioning bracket 28 for positioning in the left and right directions; two lock catches 20 are installed between the front side aluminum plate and the gap of the aluminum profile of the powder bed mechanism for fixing the powder bed mechanism.

[0044] The printing platform movement mechanism comprises ball screws 18, a transmission shaft II 19, an electromagnet mounting platform 28, electromagnets 30, pulleys 31, a servo motor IV 32, a tension pulley 33 and a lifting platform 34.

[0045] Four ball screws 18 are vertically mounted on four aluminum profiles, and the top end is horizontally mounted with the lifting platform 34. Four electromagnets 30 are mounted around the lifting platform 34. When the electromagnets are powered, the printing platform 29 is fixed on the lifting platform 34. The servo motor IV 32 is mounted on the aluminum profile between the two screws, providing power for the four ball screws. The power is transmitted to the transmission shaft 19 through belt transmission, so that the lifting platform moves up and down.

[0046] The powder laying mechanism comprises a connecting plate 11, a synchronous belt module V 12, a powder bin 13, a synchronous belt module VI 14, a scraper 35 and a servo motor V 36.

[0047] The synchronous belt module V 12 and the synchronous belt module VI 14 are installed on the rear side of the rack, and the sliding block direction is forward. The connecting plate 11 is installed above the two sliding blocks for synchronous movement and to resist bending moment. The servo motor V 36 is installed on the rear side of the connecting plate, and the servo shaft is connected with the right end shaft of the synchronous belt module V 12 to provide power for the powder bin 13. The scraper 35 is installed below the hopper 37 to scrape the filled powder on the printing plane.

[0048] The use process of the nozzle embedded type 3D printing equipment for thermosetting wood-plastic composite material is as follows:

[0049] First, the printing plane 29 is lifted to contact the nozzle 4 outlet. The outer corner aluminum 15 is used to fix the aluminum plate 24 as the outer wall of the powder bed, and the inner corner aluminum 25 and the felt 26 are used to seal between the outer wall of the powder bed and the printing plane 29. The powder bed mechanism is pushed into the designated position along the pulley 21. Then the positioning pin 16 is inserted into the holes of the positioning pin frame 27 and the powder bed positioning frame 28, and the lock buckle 20 is locked. The electromagnets 30 are powered to adsorb the printing plane 29 on the lifting plane 34, and the positioning of the powder bed mechanism is completed. Then the model slices made according to the computer aided design are input into the PC control terminal. The host computer software sends instructions to the PLC through the control terminal. Then the motion controller controls the servo motor I 5, the servo motor II 7, the servo motor III 9 and the servo motor V 36 to drive the synchronous belt module guide rail I 1, the synchronous belt module guide rail IV 10 connected with the synchronous belt module 1 through the transmission shaft I 8, the synchronous belt guide rail II 3 and the synchronous belt guide rail III 6 installed on the sliding block 2 to move. The servo motor IV 32 drives the printing plane to move along the ball screw 18 through the transmission shaft II 19, the pulley 17 and the pulley 31, realizing the three-dimensional spatial movement of the nozzle 4.

[0050] The air source is added to the glue dispensing pressure tank A and the glue dispensing pressure tank B to keep the pressure of the A glue and the B glue. When the A glue and the B glue valves are opened and the cleaning tank valve is closed, the gear pump is used to pump the A glue and the B glue into the dynamic mixing pipe, the direct current motor drives the auger to rotate to improve the uniformity of the adhesive mixing, and the dynamic mixing pipe outlet is connected with the nozzle 4 to extrude the adhesive.

[0051] When the extrusion movement mechanism drives the nozzle 4 to move, the nozzle 4 extrudes the material, while the powder bin 13 moves along the synchronous belt module guide rail V 12 and the synchronous belt module VI 14 connected by the connecting plate 11, the powder is manually added to the powder bin 13, the powder flows out from the gap of the hopper 37 installed in the powder bin 13 to the printing plane 29, and the powder is flattened under the action of the scraper 35, so that the material is stacked in the process of continuous movement and spraying; then after a long time of printing, the part printing is completed. The electromagnet 30 is powered off, the positioning pin 16 is taken out, the lock catch 20 is opened, the powder bed mechanism is taken out, and the printed part is taken out for post-processing.

[0052] When the A glue and the B glue valves are closed and the cleaning tank valve is opened, the cleaning agent is sprayed along the pipeline to achieve the effect of cleaning the pipeline and the dynamic mixing pipe, and the direct current motor is started to improve the cleaning effect.

[0053] The above-described embodiments only express the implementation of the present application, but cannot be interpreted as a limitation on the scope of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A nozzle-embedded 3D printing apparatus for thermoset wood plastic composites, characterized by, The nozzle embedded 3D printing equipment includes a rack, an extrusion movement mechanism, a powder laying mechanism, a powder bed mechanism, a printing platform movement mechanism and a feeding system, and the feeding system feeds the extrusion movement mechanism. The extrusion movement mechanism includes synchronous belt module guide rail I (1), synchronous belt module guide rail II (3), synchronous belt module guide rail III (6), synchronous belt module guide rail IV (10), a nozzle (4), servo motor I (5), servo motor II (7) and servo motor III (9); specifically, the synchronous belt module guide rail I (1) and the synchronous belt module guide rail IV are installed in parallel on the left and right sides of the top end of the rack, the sliders on the two synchronous belt module guide rails I (1) are directed upward, are connected through a transmission shaft I (8) and are powered by the servo motor III (9); the synchronous belt module guide rail II (3) is installed on the two sliders of the synchronous belt module guide rail I (1), the slider of the synchronous belt module guide rail II (3) is directed forward and is powered by the servo motor II (7); the synchronous belt module guide rail III (6) is installed vertically on the slider of the synchronous belt module guide rail II (3) and is powered by the servo motor I (5); the nozzle (4) is connected with the feeding system and is installed above the slider of the synchronous belt module guide rail III (6), so that the nozzle (4) moves together with the printing platform (29) and realizes the printing process along a specified path; The powder laying mechanism includes a connecting plate (11), a synchronous belt module V (12), a powder bin (13), a hopper (37), a synchronous belt module VI (14), a scraper (35) and a servo motor V (36); the synchronous belt module guide rails V (12) and VI (14) are installed horizontally on the rear side of the rack and are connected through the connecting plate (11); the servo motor V (36) is installed on the rear side of the connecting plate (11) and provides power for the slider movement of the synchronous belt module guide rails V (12) and VI (14); the powder bin (13) is installed on the connecting plate (11), and the hopper (37) and the scraper (35) are stacked on the powder bin (13); The powder bed mechanism includes a printing platform (29), and the bottom surface of the powder bed mechanism is a movable printing platform (29); rollers are installed on the bottom of the powder bed mechanism to push the powder bed mechanism into a working position; The printing platform movement mechanism includes a servo motor IV (32), a ball screw (18), a transmission shaft II (19), a lifting platform (34) and an electromagnet (30) for controlling the movement of the printing platform (29); the electromagnet (30) is installed on the bottom of the powder bed mechanism, and when the electromagnet (30) is electrified together with the electromagnet installed on the lifting platform (34), the powder bed mechanism is adsorbed and then fixed; The feeding system includes point glue pressure barrels A and B, a cleaning tank, gear pumps A and B, a three-way ball valve, a direct current motor and a dynamic mixing pipe, and the three-way ball valve is connected with a controllable flow direction pipe; specifically, The gas source outlet is connected to the gas inlets of the glue dispensing pressure tanks A and B through a pipeline connection point, so as to maintain the pressure of the A glue in the glue dispensing pressure tank A and the B glue in the glue dispensing pressure tank B; the gas source outlet is connected to the gas inlet of the cleaning tank through a pipeline, so as to press out the cleaning agent; the liquid outlet of the glue dispensing pressure tank A is connected to the inlet of the gear pump A, and the liquid outlet of the glue dispensing pressure tank B is connected to the inlet of the gear pump B, so that the amount and ratio of the A glue and the B glue can be accurately controlled through the control of the servo motor on the gear pump; the outlets of the gear pump A and the gear pump B are respectively connected to the first valve ports of two three-way ball valves, the second valve ports of the two three-way ball valves are connected to a flow divider, and the third valve ports of the two three-way ball valves are connected to a dynamic mixing pipe. The liquid outlet of the cleaning tank is connected to a three-way, and the other two outlets of the three-way are connected to the flow divider. A DC motor is installed at the top of the flow divider, and the inlet of the dynamic mixing pipe is installed at the lower end of the flow divider, so as to fully mix the A glue and the B glue into an adhesive; the outlet of the dynamic mixing pipe is connected to the inlet of the nozzle (4), so as to deliver the adhesive to the nozzle (4), and the nozzle (4) extrudes the adhesive to realize printing.

2. A hot-entangled wood plastic composite material 3D printing device with a nozzle embedded type according to claim 1, characterized in that, In the printing platform movement mechanism, the servo motor IV (32) provides power for the ball screw (18) through the belt wheel (17), and then drives the printing platform (29) to move vertically on the ball screw (18), so that the printing platform (29) realizes the layer-by-layer stacking of the printing model; four ball screws (18) are vertically installed on four aluminum profiles, and the top end is horizontally installed on the lifting platform (34); four electromagnets (30) are installed around the lifting platform (34), and when the electromagnets are powered on, the printing platform (29) is fixed on the lifting platform (34).

3. A nozzle-embedded 3D printing apparatus for thermoset wood plastic composites according to claim 1, characterized in that, When the A glue and the B glue valves are opened and the cleaning tank valve is closed, the A glue and the B glue enter the dynamic mixing pipe, the outlet of the dynamic mixing pipe is connected to the nozzle (4), and the DC motor drives the auger to rotate to improve the uniformity of the adhesive mixture; when the A glue and the B glue valves are closed and the cleaning tank valve is opened, the cleaning agent is sprayed out of the pipeline to achieve the effect of cleaning the pipeline and the dynamic mixing pipe; the DC motor is turned on during cleaning.

4. The hot-entangled wood plastic composite 3D printing device with nozzle embedded according to claim 1, wherein, In the extrusion movement mechanism, the servo motor III (9) is installed above the synchronous belt module guide rail I (1) in cooperation with the motor cage (23), the servo motor II (7) is installed on the right side of the synchronous belt module guide rail II (3) in cooperation with the motor cage (23), and the servo motor I (5) is installed at the top of the synchronous belt module guide rail III (6) to provide power for the sliding block.

5. The nozzle-embedded 3D printing apparatus for thermoset wood plastic composites according to claim 1, wherein In the extrusion movement mechanism, a bracket (22) is installed on the sliding block (2) of each of the two synchronous belt module guide rails I (1), which is used to install the synchronous belt module guide rail II (3).

6. The nozzle-embedded 3D printing apparatus for thermoset wood plastic composites according to claim 1, wherein The outer wall of the powder bed mechanism is composed of four aluminum plates (24), two adjacent aluminum plates (24) in the outer wall of the powder bed mechanism are fixed by inner corner aluminum (25) and outer corner aluminum (15), a plurality of pulleys (21) are installed on the aluminum profiles on both sides of the powder bed mechanism, a lock catch (20) is installed between the front side aluminum plate (24) and the aluminum profile gap of the powder bed mechanism for fixing the powder bed mechanism, the positioning pin rack 27 on the rear side of the powder bed mechanism and the powder bed positioning rack (28) are connected by a positioning pin (26) to complete the positioning of the powder bed mechanism.

7. The hot-entangled wood plastic composite 3D printing device with nozzle embedded according to claim 1, wherein, A felt is installed between the printing platform (29) and the outer wall of the powder bed mechanism.

8. The nozzle-embedded 3D printing apparatus for thermoset wood plastic composites according to claim 1, characterized in that, In the powder spreading mechanism, the scraper (35) is installed below the hopper (37) to scrape the filled powder on the printing plane, and a layer of powder is spread on the printing platform (29) during the movement of the powder bin (13) and is flattened by the scraper (35).

9. The hot-entangled wood plastic composite 3D printing device with nozzle embedded according to claim 1, wherein, In the printing platform movement mechanism, the tightness of the conveying belt is adjusted by the tensioning wheel (33).

Images