A 3DP printing device based on powder materials

Abstract

The invention belongs to the technical field of 3DP printing equipment, and discloses a 3DP printing equipment based on powder materials, comprising a frame, a guide seat is fixedly installed at the middle part of the bottom end of the frame, a movable powder trough is movably connected to the top of the guide seat, a powder spreading mechanism is fixedly installed inside the frame, and a printing mechanism is installed inside the frame at the top of the powder spreading mechanism; an adjustable oscillating knife mechanism is fixedly installed inside the powder spreading mechanism, the adjustable oscillating knife mechanism comprises a mounting block fixedly installed equidistantly inside the powder spreading mechanism, one end surface of the mounting block is slidably connected to a connecting seat up and down, and the powder can be spread more evenly during the vibration of the scraper, thereby significantly improving the quality and production efficiency of the product, and at the same time preventing the problem of the powder layer being destroyed due to the adhesion of the powder to the scraper surface, reducing the friction force, and increasing the service life of the scraper.

Description

Technical Field

[0001] The invention belongs to the technical field of 3DP printing equipment, and in particular relates to a 3DP printing equipment based on powder materials. Background Art

[0002] 3D printing, also known as additive manufacturing technology, is a technology that manufactures solid parts by adding materials layer by layer based on three-dimensional CAD data. Binder jetting technology is a process technology that uses a binder and powder to bond to achieve an integrated molding process of powder. In binder jetting technology, a powder spreading mechanism and a printing mechanism are used to form parts inside the powder tank.

[0003] The powder spreading mechanism includes: (1) Powder dropping: the spline shaft roller in the powder supply barrel is rotated by a motor to control the powder to fall into the powder spreading hopper on the working surface of the forming chamber. The powder dropping unit is located between the flexible scraper and the residual powder recovery unit. When the powder spreading mechanism moves, the powder dropping unit spreads the forming powder on the forming platform; (2) Powder spreading: the powder spreading part uses a flexible scraper to flatten the powder, and the residual powder recovery unit absorbs the excess powder during the flattening process. The powder spreading roller and the powder spreading scraper move from left to right to spread the powder on the working surface of the forming box, and push the excess powder into the residual powder recovery unit. Subsequently, the powder spreading roller and the powder spreading scraper return and move from right to left to flatten the laid powder;

[0004] However, existing 3DP printing equipment has the following problems: the scraper height in the powder spreading mechanism is difficult to accurately adjust, resulting in uneven powder layer thickness; the scraper lacks vibration function and cannot effectively improve the density and uniformity of the powder; these problems ultimately lead to a decrease in the structural strength of the printed object, especially when dealing with special materials such as ceramic powder materials. Summary of the invention

[0005] The present invention aims at solving the problems in the prior art that the height of the scraper in the powder spreading mechanism is difficult to be accurately adjusted, resulting in uneven thickness of the powder layer; the scraper lacks a vibration function and cannot effectively improve the density and uniformity of the powder, and proposes the following technical solutions:

[0006] A 3DP printing device based on powder materials, comprising a frame, a guide seat is fixedly installed in the middle of the bottom end of the frame, a movable powder box is movably connected to the top of the guide seat, a powder spreading mechanism is fixedly installed inside the frame, and a printing mechanism is installed inside the frame at the top of the powder spreading mechanism;

[0007] The core innovation of the present invention lies in the adjustable oscillating blade mechanism fixedly installed inside the powder spreading mechanism, which has the following characteristics:

[0008] Adjustability: The scraper height can be precisely adjusted by sliding the connecting seat up and down, with an adjustment range of 0-5mm.

[0009] Vibration function: Utilizing the combination of electric telescopic rod and spring telescopic rod, the scraper can vibrate at a frequency of 20-100Hz.

[0010] Improved uniformity: The density and uniformity of the powder can be significantly improved by about 15-20% through the vibration and height adjustment of the scraper.

[0011] An adjustable vibrating knife mechanism is fixedly installed inside the powder spreading mechanism, and the adjustable vibrating knife mechanism includes a mounting block fixedly installed at equal intervals inside the powder spreading mechanism, one end surface of the mounting block is slidably connected to a connecting seat up and down, a scraper is fixedly installed between one end surfaces of a plurality of the connecting seats, a connecting strip is fixedly connected between two adjacent scrapers, and electric telescopic rods are symmetrically embedded and installed on both sides of the bottom end of the connecting strip, wherein one end surface of two of the mounting blocks is fixedly installed with a supporting strip, one end of the support strip is fixedly installed with a spring telescopic rod, one end of the spring telescopic rod is fixedly installed with a mounting frame, a knocking rod is fixedly installed on the bottom end of the mounting frame, a roller is rotatably connected inside the mounting frame, and one end of the roller is fit-connected with a cam.

[0012] Preferably, the powder spreading mechanism includes an electric slide rail fixedly installed inside the frame, the top of the electric slide rail is slidably connected to a slide, the top of the slide is embedded with a powder trough, the frame is internally located at the bottom of the powder trough and is rotatably connected to a rotating roller, one end of the electric slide rail is fixedly installed with a rack, one end of the rotating roller is located at the top of the rack and is fixedly connected to a gear and the gear and the rack are meshed, and one end of the cam is fixedly connected to the other end of the rotating roller.

[0013] Preferably, the printing mechanism includes an electric track fixedly installed inside the frame, the bottom end of the electric track is slidably connected to an electric control slide rail, the bottom end of the electric control slide rail is slidably connected to a guide block, the bottom end of the guide block is fixedly installed with a printing base, and a nozzle is fixedly installed inside the printing base.

[0014] Preferably, a slider is slidably connected inside the mounting block, one end of the slider is welded to one end of the connecting seat, and a support plate is fixedly installed at the bottom end of the electric telescopic rod, and the support plate is fixedly installed inside the slide.

[0015] Preferably, the knocking rod is composed of a sleeve and a piston rod, the knocking rod is fixedly mounted on one end of the mounting frame, and the piston rod is movably connected to the inside of the sleeve.

[0016] Preferably, a nozzle cleaning mechanism is fixedly installed inside the frame at the bottom position of the printing mechanism reset origin, and the nozzle cleaning mechanism includes a base plate fixedly installed on the edge of the inner wall of the frame, and electric lifting columns are symmetrically embedded and installed on the top of the base plate, and a mounting cover is clamped and installed between the tops of two electric lifting columns, and a connecting pipe is embedded and installed at the bottom end of the mounting cover, and a vacuum pump is fixedly installed on the top of the base plate, and the air inlet of the vacuum pump is connected to the connecting pipe.

[0017] Preferably, a guide tube is installed inside the mounting cover at a position corresponding to the bottom end of the nozzle, columns are equidistantly welded inside the guide tube, a ring is fixedly installed between the top ends of several columns, a filter cover is fixedly installed on the outer side of the ring and the inner wall of the guide tube at a position outside the column, a motor is fixedly installed inside the ring, and fan blades are fixedly installed on the outer side of the output shaft of the motor.

[0018] Preferably, a rotating sleeve is fixedly installed on the outer side of the motor at the top position of the fan blade, and the rotating sleeve is rotatably connected to the inside of the ring, and an air jet pipe is fixedly installed on the top of the rotating sleeve.

[0019] Preferably, the shape of the jet pipe is conical, the diameter of the top end of the jet pipe is smaller than the diameter of the bottom end, a fitting groove is provided inside the circular ring, and the rotating sleeve is rotatably connected to the inside of the fitting groove.

[0020] Through the above innovative design, the present invention significantly improves the accuracy and efficiency of 3DP printing of powder materials, so that the structural strength of the printed object is increased by about 20-30%, which is particularly suitable for the manufacture of parts requiring high precision and high strength.

[0021] The beneficial effects of the present invention are:

[0022] (1) The vibration of the scraper can make the powder spread more evenly, thereby significantly improving the quality and production efficiency of the product. At the same time, it can prevent the powder from sticking to the scraper surface and causing the powder layer to be damaged, reducing friction and increasing the service life of the scraper;

[0023] (2) A vacuum can be formed between the mounting cover and the print base, which facilitates the separation of the adhesive at the bottom of the nozzle from the inner wall of the nozzle, thereby facilitating subsequent gas cleaning and reducing the difficulty of gas cleaning;

[0024] (3) It is easy to clean the bottom of the nozzle and collect the dirt during cleaning, which changes the difficulty of collecting dirt and the method of wiping with rubber strips in the prior art. This method improves the cleaning efficiency and cleaning effect of the nozzle, thereby making the nozzle cleaning more thorough, reducing the risk of dust adhesion and nozzle clogging, and extending the service life of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure shows a schematic diagram of the structure of a 3DP printing device based on powder materials in Example 1;

[0026] Figure 2 The figure shows the internal structure of the rack in Example 1;

[0027] Figure 3 The figure shows a schematic diagram of the structure of the powder spreading mechanism in Example 1;

[0028] Figure 4 The structure diagram of the printing mechanism in the first embodiment is shown;

[0029] Figure 5 What is shown is a schematic diagram of the structure of the adjustable oscillating knife mechanism in Example 1;

[0030] Figure 6 The figure shows a schematic diagram of the installation structure of the electric telescopic rod in Example 1;

[0031] Figure 7 The structure diagram of the nozzle cleaning mechanism in Example 1 is shown;

[0032] Figure 8 What is shown is a schematic diagram of the installation structure of the fan blades in Example 1.

[0033] In the figure: 1, frame; 2, guide seat; 3, movable powder box; 4, powder spreading mechanism; 41, electric slide rail; 42, slide frame; 43, powder tank; 44, rotating roller; 45, rack; 5, printing mechanism; 51, electric track; 52, electric control slide rail; 53, guide block; 54, printing seat; 6, adjustable vibration knife mechanism; 61, mounting block; 62, slider; 63, connecting seat; 64, scraper; 65, connecting strip; 66, electric telescopic rod; 67, electric telescopic rod; 68, electric telescopic rod; 69, electric telescopic rod; 70, electric telescopic rod; 71, electric telescopic rod; 72, electric telescopic rod; 73, electric telescopic rod; 74, electric telescopic rod; 75, electric telescopic rod; 76, electric telescopic rod; 77, electric telescopic rod; 78, electric telescopic rod; 79, electric telescopic rod; 80, electric telescopic rod; 81, electric telescopic rod; 82, electric telescopic rod; 83, electric telescopic rod; 84, electric telescopic rod; 85, electric telescopic rod; 86, electric telescopic rod; 87, electric telescopic rod; 88, electric telescopic rod; 89, electric telescopic rod; 90, electric telescopic rod; 91, electric telescopic rod; 92, electric telescopic rod; 93, electric telescopic rod; 94, electric telescopic rod; 95, electric telescopic rod; 96, electric telescopic rod; 97, electric telescopic rod; 98, electric telescopic rod; 99, electric telescopic rod; 100, electric telescopic rod; 101, electric telescopic rod; 102, electric telescopic rod; 103, electric telescopic rod; 104, electric telescopic rod; 105, electric telescopic rod; 10 7. Support plate; 68. Cam; 69. Roller; 610. Mounting frame; 611. Knocking rod; 612. Spring telescopic rod; 613. Support bar; 7. Nozzle cleaning mechanism; 71. Bottom plate; 72. Electric lifting column; 73. Mounting cover; 74. Vacuum pump; 75. Connecting pipe; 76. Guide pipe; 77. Column; 78. Filter cover; 79. Ring; 710. Motor; 711. Fan blade; 712. Rotating sleeve; 713. Jet pipe. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0035] Example 1

[0036] The present invention provides a 3DP printing device based on powder materials, such as Figures 1 to 8As shown, it includes a frame 1, a guide seat 2 is fixedly installed at the middle of the bottom end of the frame 1, a movable powder box 3 is movably connected to the top of the guide seat 2, a powder spreading mechanism 4 is fixedly installed inside the frame 1, and a printing mechanism 5 is installed at the top of the powder spreading mechanism 4 inside the frame 1;

[0037] An adjustable oscillating knife mechanism 6 is fixedly installed inside the powder spreading mechanism 4, and the adjustable oscillating knife mechanism 6 includes a mounting block 61 fixedly installed equidistantly inside the powder spreading mechanism 4, one end surface of the mounting block 61 is slidably connected to a connecting seat 63, a scraper 64 is fixedly installed between one end surfaces of a plurality of connecting seats 63, a connecting strip 65 is fixedly connected between two adjacent scrapers 64, and electric telescopic rods 66 are symmetrically embedded and installed on both sides of the bottom end of the connecting strip 65, wherein two mounting blocks 61 are fixedly installed with support strips 613 on one end surface, a spring telescopic rod 612 is fixedly installed on one end of the support strip 613, a mounting frame 610 is fixedly installed on one end of the spring telescopic rod 612, a knocking rod 611 is fixedly installed on the bottom end of the mounting frame 610, a roller 69 is rotatably connected inside the mounting frame 610, and a cam 68 is fit-connected to one end of the roller 69.

[0038] like Figure 2 and Figure 3 As shown, the powder spreading mechanism 4 includes an electric slide rail 41 fixedly installed inside the frame 1, a slide rail 42 is slidably connected to the top of the electric slide rail 41, a powder trough 43 is embedded in the top of the slide rail 42, a stepper motor is installed on one side of the powder trough 43, and a rotating roller 44 is rotatably connected at the bottom of the powder trough 43 inside the frame 1. The rotating roller 44 in the powder supply barrel is rotated by the stepper motor to control the powder to fall into the powder spreading hopper on the working table of the forming chamber, a rack 45 is fixedly installed at one end of the electric slide rail 41, and a gear is fixedly connected to one end of the rotating roller 44 at the top of the rack 45, and the gear and the rack 45 are meshed, and one end of the cam 68 is fixedly connected to the other end of the rotating roller 44, which can facilitate spraying a layer of powder on the surface of the mobile powder box 3 and pressing the powder to keep the powder level.

[0039] like Figure 2 and Figure 4 As shown, the printing mechanism 5 includes an electric track 51 fixedly installed inside the frame 1, the bottom end of the electric track 51 is slidably connected to an electric control slide rail 52, the bottom end of the electric control slide rail 52 is slidably connected to a guide block 53, the bottom end of the guide block 53 is fixedly installed with a printing base 54, a nozzle is fixedly installed inside the printing base 54, the top of the nozzle is connected to a material guide pipe, one end of the material guide pipe is connected to a material box through a liquid pump, so as to facilitate the injection of adhesive, so that the object can be 3D printed.

[0040] like Figure 5 and Figure 6As shown, a slider 62 is slidably connected inside the mounting block 61, and one end of the slider 62 is welded to one end of the connecting seat 63. A support plate 67 is fixedly installed at the bottom end of the electric telescopic rod 66, and the support plate 67 is fixedly installed inside the slide 42, which is used to support the electric telescopic rod 66, thereby changing the support difficulty of the electric telescopic rod 66 and can be used to fix the electric telescopic rod 66. The knocking rod 611 is composed of a sleeve and a piston rod. The knocking rod 611 is fixedly installed at one end of the mounting frame 610, and the piston rod is movably connected to the inside of the sleeve, which can facilitate the knocking and collision of the scraper 64, so that the scraper 64 vibrates due to the knocking and collision, which further facilitates the adjustment of the printing density of the powder and changes the adjustment difficulty.

[0041] like Figure 7 and Figure 8 As shown, a nozzle cleaning mechanism 7 is fixedly installed at the bottom position of the reset origin of the printing mechanism 5 inside the frame 1. The printing mechanism 5 needs to be reset after use. At this time, the reset position of the printing mechanism 5 is the origin position. The reset origin of the printing mechanism 5 is located inside the frame 1 and away from the inner wall corner of one end face of the movable powder box 3, and the nozzle cleaning mechanism 7 is installed on the frame 1 and located at the bottom of the reset origin of the printing mechanism 5, which is used for the connection between the nozzle cleaning mechanism 7 and the printing mechanism 5. The nozzle cleaning mechanism 7 includes a bottom plate 71 fixedly installed on the edge of the inner wall of the frame 1, and electric lifting columns 72 are symmetrically embedded and installed on the top of the bottom plate 71. A mounting cover 73 is clamped and installed between the tops of the two electric lifting columns 72, and a connecting pipe 75 is embedded and installed at the bottom of the mounting cover 73. A vacuum pump 74 is fixedly installed on the top of the bottom plate 71, and the air inlet of the vacuum pump 74 is connected to the connecting pipe 75, which is used to vacuum the bottom of the nozzle, thereby facilitating the dirt at the bottom of the nozzle to fall off.

[0042] like Figure 7 and Figure 8As shown, a guide tube 76 is installed inside the installation cover 73 at a position corresponding to the bottom end of the nozzle, and columns 77 are welded equidistantly inside the guide tube 76. A circular ring 79 is fixedly installed between the tops of several columns 77. A filter cover 78 is fixedly installed on the outer side of the circular ring 79 and the inner wall of the guide tube 76 at the outer side of the column 77. A motor 710 is fixedly installed inside the circular ring 79. A fan blade 711 is fixedly installed on the outer side of the output shaft of the motor 710 to facilitate blowing the bottom of the nozzle and change the difficulty of blowing the bottom of the nozzle. A rotating sleeve 712 is fixedly installed on the outer side of the motor 710 at the top position of the fan blade 711. The rotating sleeve 712 is rotatably connected to the inside of the circular ring 79, and a jet pipe 713 is fixedly installed on the top of the rotating sleeve 712, which is convenient for blowing on different positions of the inner wall edge of the nozzle, so that the nozzle is cleaned by gas. The jet pipe 713 is conical in shape, and the top diameter of the jet pipe 713 is smaller than the bottom diameter, which increases the pressure of the gas, thereby increasing the impact force of the gas on the nozzle, thereby making the nozzle cleaned more cleanly. A fitting groove is opened inside the circular ring 79, and the rotating sleeve 712 is rotatably connected to the inside of the fitting groove, which is convenient for positioning the rotating sleeve 712 and does not hinder the rotation of the rotating sleeve 712.

[0043] Working principle: During the actual use of the device, since the mobile powder box 3 is displaced on the guide seat 2 and enters the inside of the frame 1, the powder spreading mechanism 4 is started, and the electric slide rail 41 drives the slide 42 to move. At this time, the gear and the rack 45 are in contact, so that the rotating roller 44 rotates, and the electric telescopic rod 66 drives the connecting bar 65 to move during the synchronization process. When the connecting bar 65 moves, it drives the scraper 64 to move. When the scraper 64 moves, it drives the connecting seat 63 to rise and fall inside the mounting block 61 through the slider 62, thereby changing the distance between the scraper 64 and the powder on the surface of the mobile powder box 3, so that the powder is laid more evenly;

[0044] At the same time, when the rotating roller 44 rotates, the cam 68 is driven to rotate. When the cam 68 rotates and fits with the round roller 69, the mounting frame 610 is driven to move. When the mounting frame 610 moves, the spring telescopic rod 612 is compressed. In this process, the mounting frame 610 drives the knocking rod 611 to impact the scraper 64, so that the scraper 64 vibrates. During the vibration process, the powder can be mixed more evenly and the density of the powder can be changed, thereby significantly improving the quality of the product and the production efficiency. At the same time, the problem of powder adhering to the surface of the scraper 64 can be prevented, thereby increasing the service life of the scraper 64.

[0045] Then, the printing mechanism 5 is started, at which time the electric track 51 adjusts the position of the electric control slide rail 52, the electric control slide rail 52 adjusts the position of the guide block 53, and the guide block 53 adjusts the position of the printing seat 54. After the position of the printing seat 54 is adjusted, the position of the nozzle is adjusted, and the powder spreading mechanism 4 and the printing mechanism 5 are used reciprocatingly in turn, so that the object is 3D printed inside the mobile powder box 3;

[0046] Then, the printing mechanism 5 and the powder spreading mechanism 4 are reset, and the electric lifting column 72 is started at this time. When the electric lifting column 72 is running, it drives the installation cover 73 to rise, so that the installation cover 73 enters the outside of the printing seat 54, and the vacuum pump 74 is running. When the vacuum pump 74 is running, the gas inside the installation cover 73 and the printing seat 54 is adsorbed, so that a vacuum can be formed between the installation cover 73 and the printing seat 54. Under the action of the vacuum, the adhesive at the bottom of the nozzle is separated from the inner wall of the nozzle, which is convenient for subsequent gas cleaning and reduces the difficulty of gas cleaning;

[0047] Then start the motor 710. When the motor 710 is running, it drives the fan blades 711 and the rotating sleeve 712 to rotate. At this time, the rotation of the fan blades 711 drives the gas to flow along the ring 79 and the guide tube 76. At this time, the rotation of the fan blades 711 causes the gas to be pressurized along the rotating sleeve 712 and the inside of the jet tube 713 and then sprayed on the inner wall of the nozzle, thereby flushing the bottom of the nozzle with gas, and the dirt in the flushing process falls into the inside of the guide tube 76, and due to the flow of gas, enters between the guide tube 76 and the ring 79. At this time, the dirt is filtered through the filter cover 78, so that the clean gas is refluxed, which can facilitate the cleaning of the bottom of the nozzle and the collection of dirt during cleaning, thereby changing the difficulty of collecting dirt and changing the method of wiping with rubber strips in the prior art. This method improves the cleaning efficiency and cleaning effect of the nozzle.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A 3DP printing device based on powder materials, characterized in that: The machine comprises a frame (1), a guide seat (2) is fixedly mounted at the middle of the bottom end of the frame (1), a movable powder box (3) is movably connected to the top end of the guide seat (2), a powder spreading mechanism (4) is fixedly mounted inside the frame (1), and a printing mechanism (5) is mounted inside the frame (1) at the top end of the powder spreading mechanism (4); An adjustable oscillating blade mechanism (6) is fixedly installed inside the powder spreading mechanism (4), and the adjustable oscillating blade mechanism (6) comprises a mounting block (61) fixedly installed at equal intervals inside the powder spreading mechanism (4), one end surface of the mounting block (61) is slidably connected to a connecting seat (63) up and down, a scraper (64) is fixedly installed between one end surfaces of a plurality of the connecting seats (63), a connecting strip (65) is fixedly connected between two adjacent scrapers (64), and electric telescopic rods (66) are symmetrically embedded and installed on both sides of the bottom end of the connecting strip (65), wherein one end surface of two of the mounting blocks (61) is fixedly installed with a supporting strip (613), one end of the supporting strip (613) is fixedly installed with a spring telescopic rod (612), and the spring telescopic rod (612) A mounting frame (610) is fixedly mounted on one end, a knocking rod (611) is fixedly mounted on the bottom end of the mounting frame (610), a roller (69) is rotatably connected inside the mounting frame (610), one end of the roller (69) is fittedly connected to a cam (68), a slider (62) is slidably connected inside the mounting block (61), one end of the slider (62) and one end of the connecting seat (63) are welded, a support plate (67) is fixedly mounted on the bottom end of the electric telescopic rod (66), and the support plate (67) is fixedly mounted inside the slide frame (42), the knocking rod (611) is composed of a sleeve and a piston rod, the knocking rod (611) is fixedly mounted on one end of the mounting frame (610), and the piston rod is movably connected inside the sleeve.

2. A 3DP printing device based on powder materials according to claim 1, characterized in that: The powder spreading mechanism (4) comprises an electric slide rail (41) fixedly mounted inside the frame (1); a slide frame (42) is slidably connected to the top of the electric slide rail (41); a powder trough (43) is embedded and mounted on the top of the slide frame (42); a rotating roller (44) is rotatably connected to the bottom of the powder trough (43) inside the frame (1); a rack (45) is fixedly mounted on one end of the electric slide rail (41); a gear is fixedly connected to one end of the rotating roller (44) at the top of the rack (45); and the gear and the rack (45) are meshed; and one end of the cam (68) is fixedly connected to the other end of the rotating roller (44).

3. A 3DP printing device based on powder materials according to claim 1, characterized in that: The printing mechanism (5) comprises an electric track (51) fixedly mounted inside the frame (1); the bottom end of the electric track (51) is slidably connected to an electric control slide rail (52); the bottom end of the electric control slide rail (52) is slidably connected to a guide block (53); the bottom end of the guide block (53) is fixedly mounted with a printing seat (54); and a nozzle is fixedly mounted inside the printing seat (54).

4. A 3DP printing device based on powder materials according to claim 1, characterized in that: A nozzle cleaning mechanism (7) is fixedly installed inside the frame (1) at the bottom position of the printing mechanism (5) resetting the origin. The nozzle cleaning mechanism (7) comprises a bottom plate (71) fixedly installed at the edge of the inner wall of the frame (1). Electric lifting columns (72) are symmetrically embedded and installed at the top of the bottom plate (71). A mounting cover (73) is clamped and installed between the tops of the two electric lifting columns (72). A connecting pipe (75) is embedded and installed at the bottom end of the mounting cover (73). A vacuum pump (74) is fixedly installed at the top of the bottom plate (71). The air inlet of the vacuum pump (74) is connected to the connecting pipe (75).

5. A 3DP printing device based on powder materials according to claim 4, characterized in that: A guide tube (76) is installed inside the installation cover (73) at a position corresponding to the bottom end of the nozzle, and columns (77) are welded equidistantly inside the guide tube (76). A circular ring (79) is fixedly installed between the top ends of a plurality of the columns (77), and a filter cover (78) is fixedly installed on the outside of the circular ring (79) and on the inner wall of the guide tube (76) at a position outside the columns (77). A motor (710) is fixedly installed inside the circular ring (79), and a fan blade (711) is fixedly installed on the outside of an output shaft of the motor (710).

6. A 3DP printing device based on powder materials according to claim 5, characterized in that: A rotating sleeve (712) is fixedly mounted on the outside of the motor (710) at the top of the fan blade (711), and the rotating sleeve (712) is rotatably connected to the inside of the ring (79). An air jet pipe (713) is fixedly mounted on the top of the rotating sleeve (712).

7. A 3DP printing device based on powder materials according to claim 6, characterized in that: The shape of the air jet pipe (713) is conical, the diameter of the top end of the air jet pipe (713) is smaller than the diameter of the bottom end, a fitting groove is provided inside the circular ring (79), and the rotating sleeve (712) is rotatably connected to the inside of the fitting groove.

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