An additive manufacturing device based on digital model

Abstract

The present invention belongs to the technical field of additive manufacturing powder recovery, and specifically relates to an additive manufacturing device based on a digital model, including a workbench, a support frame and a guide hopper, and also includes: a quantitative feeding mechanism, the quantitative feeding mechanism is arranged at the lower end of the guide hopper, and is used to control the feeding speed of the powder; a screening box, the screening box is fixedly connected to the lower end of the quantitative feeding mechanism, and the lower end of the screening box is also fixedly connected to a collecting box, and the right end of the screening box is provided with a sealing cover; a powder processing mechanism, the powder processing mechanism includes a screening part, the screening part is arranged inside the screening box, and the inside of the screening box is also provided with an oscillating part, the front and rear ends of the screening box are provided with a cleaning part, and the inside of the collecting box is provided with a de-impurity part. The present invention adopts a fully enclosed design, with a built-in high-efficiency filtering structure, to prevent metal powder leakage from polluting the environment, and at the same time realizes the recycling and utilization of powder to reduce resource waste.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing powder recovery, and in particular relates to an additive manufacturing device based on a digital model. Background Art

[0002] In recent years, with the continuous emergence of high-power, high-performance laser processing equipment, laser cladding and laser rapid prototyping technologies, which are closely related to additive manufacturing and 3D printing technologies, have increasingly attracted great attention and have developed rapidly in various fields such as automobiles, energy, electronics, aerospace, and heavy machinery.

[0003] Additive Manufacturing (AM) technology is a technology that uses the method of gradually accumulating materials to manufacture physical parts. Compared with the traditional material removal-cutting processing technology, it is a "bottom-up" manufacturing method. In the past two decades, AM technology has achieved rapid development. Different names such as "Rapid Prototyping", "3D Printing", and "Solid Free-form Fabrication" express the characteristics of this technology from different aspects. However, in the additive manufacturing process (based on the process characteristics of additive manufacturing equipment that processes layer by layer, a new layer of powder must be spread before each scanning process for sintering or melting), the alloy powder or metal powder is not completely melted to form a cladding layer, and a part of it will fall directly on the workbench. At present, the utilization rate of alloy powder formed by laser cladding or laser 3D printing is only 40% to 60%, and half of the powder is directly wasted; in order to improve the utilization rate of alloy powder and avoid waste, the alloy powder spilled on the workbench is generally recycled and reused, such as the application number: CN201811503336.4, a powder recovery workbench for metal 3D printing. The 3D printing workbench recycles the powder that has not been melted by the laser through the powder recovery workbench without transfer, thereby reducing the waste of powder transfer process and improving the powder recovery rate.

[0004] However, it is not difficult to find that the above-mentioned 3D printing workbench still has some shortcomings during actual use. First, it is difficult to effectively separate and recycle high-quality powders by using fixed screens and simple vibration mechanisms for screening, which limits the reuse efficiency and production quality of powders. Secondly, since the metal powders themselves are relatively fine, they are very dense when piled together and are not easy to move. The screening efficiency is low and it is easy to get blocked, which affects the subsequent processes. In addition, the powders are exposed to the air during screening, which will cause dust to splash during the screening process and pollute the surrounding environment. Summary of the invention

[0005] The purpose of the present invention is to provide an additive manufacturing device based on a digital model, which adopts a fully enclosed design and a built-in high-efficiency filtering structure to prevent metal powder from leaking and polluting the environment, while realizing the recycling of powder and reducing resource waste.

[0006] The technical solution adopted by the present invention is as follows:

[0007] An additive manufacturing device based on a digital model comprises a workbench, a support frame is arranged at the lower end of the workbench, a guide hopper is fixedly connected to the lower end of the workbench, and further comprises:

[0008] A quantitative feeding mechanism, which is arranged at the lower end of the guide hopper and is used to control the feeding speed of the powder;

[0009] A screening box, the screening box is fixedly connected to the lower end of the quantitative feeding mechanism, the lower end of the screening box is also fixedly connected to a collecting box, a sealing cover is provided at the right end of the screening box, and the quantitative feeding mechanism, the screening box and the collecting box are interconnected;

[0010] The powder processing mechanism comprises a screening part, the screening part is arranged inside a screening box, an oscillating part is also arranged inside the screening box, a cleaning part is arranged at the front and rear ends of the screening box, and a de-impurity part is arranged inside the collecting box.

[0011] In a preferred embodiment, the quantitative feeding mechanism includes a feeding shell, which is connected to the lower end of the guide hopper, and a first rotating rod is rotatably connected to the feeding shell, and a guide plate is connected to the outer wall of the first rotating rod in a ring-shaped manner, and a driving motor is fixedly installed on one side of the feeding shell, and the output shaft of the driving motor is fixedly connected to one end of the first rotating rod, and a driving gear is fixedly installed on the other end of the first rotating rod.

[0012] In a preferred embodiment, the screening part includes a screening drum, which is rotatably arranged in a screening box, the left end of the screening box is rotatably connected to a second rotating rod, and the right end of the second rotating rod is fixedly connected to the inner wall of the screening drum by a support rod, the left end of the second rotating rod is fixedly installed with a first transmission gear, the left end of the screening box is provided with a material conveying channel, and the upper end of the material conveying channel is connected to a lower material shell, and the inner wall of the screening drum is connected with a metal elastic plate in a ring-shaped manner.

[0013] In a preferred embodiment, the oscillation part includes a cylinder, which is rotatably mounted on the outer wall of the second rotating rod, and one end of the cylinder is fixedly connected to the inner wall of the screening box, and the cylinder is connected to fixed rods distributed in an array, and one end of the fixed rod is fixedly connected to a ball.

[0014] In a preferred embodiment, the cleaning part includes two air storage tubes, which are respectively arranged at the front and rear ends of the screening box, and the sides of the two air storage tubes close to each other are provided with nozzles distributed in an array, the left end of the screening box is fixedly connected with two air cylinders, the two air cylinders are connected with air supply pipes, the air supply pipes are connected with diversion pipes, and the other end of the diversion pipe is connected with the air storage tubes, the ends of the two air cylinders close to each other are piston-type plug-in with movable rods, the ends of the two movable rods away from each other are fixedly connected with piston plates, the ends of the two movable rods close to each other are fixedly connected with elliptical rings, and the left end outer wall of the second rotating rod is fixedly sleeved with a lever.

[0015] In a preferred embodiment, the impurity removal part includes a third rotating rod, which is rotatably arranged on the collecting box, and the outer wall of the third rotating rod is provided with turning plates distributed in an array, and the inner walls on both sides of the front and rear sides of the collecting box are connected with electromagnetic plates distributed in an array, one end of the third rotating rod is fixedly connected to the second transmission gear, and the lower end of the collecting box is pulled out and plugged with a baffle.

[0016] In a preferred embodiment, one end of the baffle is fixedly connected to a sealing plate, and the sealing plate is also connected to a handle. A slide groove is provided at the lower end of the collection box, and the baffle is slidably connected in the slide groove provided at the lower end of the collection box, and a rubber pad is provided in the slide groove.

[0017] In a preferred embodiment, the quantitative feeding mechanism further comprises a round rod, which is fixedly connected to the left and right inner walls of the feeding shell, and a round tube is rotatably sleeved on the outer wall of the round rod, wherein the guide plate is a plastic elastic plate.

[0018] In a preferred embodiment, the diameter of the screening cylinder gradually increases from the left end to the right end.

[0019] The technical effects achieved by the present invention are:

[0020] The present invention ensures that the screening process receives powder continuously and evenly through a precise quantitative feeding mechanism, avoiding repeated screening and energy waste caused by excessive feeding, and significantly improving the utilization rate of metal powder. The traditional powder recovery rate is low, while the design of the present invention helps to more efficiently recover and reuse unmelted powder, reducing resource waste and improving economic benefits;

[0021] The screening drum of the present invention hits the internal balls during rotation to generate vibrations, which effectively prevents powder adhesion and clogging and improves screening efficiency. At the same time, the compressed air jet cleaning prevents powder from clogging the sieve holes, ensuring the consistency and reliability of the screening effect. In addition, the sieved powder is magnetically adsorbed by the electromagnetic plate to remove ferromagnetic impurities, improve the purity of the powder, and help improve production quality. The entire process adopts a fully enclosed design to reduce dust leakage and reduce environmental pollution.

[0022] The guide plate of the present invention is made of plastic elastic material. The deformation and vibration generated when it contacts the round tube help to remove residual powder, keep the inside of the equipment clean, and reduce the failure rate caused by residual powder. The round tube can rotate when in contact with the guide plate, which reduces the friction and wear between the two, prolongs the service life of the equipment, and indirectly reduces the cost of maintenance and replacement of parts. In addition, the cleaning and impurity removal mechanism of the screening drum simplifies the later maintenance work, making the operation of the entire system more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 The present invention Figure 1 A cross-sectional view of

[0025] Figure 3 It is a structural schematic diagram of the quantitative feeding mechanism and the powder processing mechanism of the present invention;

[0026] Figure 4 The present invention Figure 3 's right side diagram;

[0027] Figure 5 It is a schematic diagram of the interior of the blanking shell of the present invention;

[0028] Figure 6 The present invention Figure 3 A cross-sectional view of

[0029] Figure 7 It is a partial structural schematic diagram of the powder processing mechanism of the present invention;

[0030] Figure 8 The present invention Figure 7 Right view of;

[0031] Fig. 9 is a cross-sectional view of a screening box of the present invention;

[0032] Fig.10 It is a cross-sectional view of the collecting box of the present invention.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1. Workbench; 2. Support frame; 3. Material guide hopper; 4. Quantitative feeding mechanism; 5. Screening box; 51. Sealing cover; 6. Collection box; 7. Powder handling mechanism;

[0035] 401, material discharging shell; 402, first rotating rod; 403, material guide plate; 404, driving motor; 405, driving gear; 406, round rod; 407, round tube;

[0036] 71. Screening section; 72. Oscillation section; 73. Cleaning section; 74. De-impurity section;

[0037] 711, screening cylinder; 712, second rotating rod; 713, first transmission gear; 714, material conveying channel; 715, metal elastic plate;

[0038] 721, cylinder; 722, fixed rod; 723, sphere;

[0039] 731, gas storage tube; 732, gas cylinder; 733, gas delivery tube; 734, shunt tube; 735, movable rod; 736, piston plate; 737, oval ring; 738, lever;

[0040] 741, the third rotating rod; 742, the turning plate; 743, the electromagnetic plate; 744, the second transmission gear; 745, the baffle. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0044] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0045] Please see attached Figure 1-Figure 10 As shown, this embodiment provides an additive manufacturing device based on a digital model, including a workbench 1, a support frame 2 is provided at the lower end of the workbench 1, a guide hopper 3 is fixedly connected to the lower end of the workbench 1, and further includes:

[0046] A quantitative feeding mechanism 4 is provided at the lower end of the guide hopper 3 and is used to control the feeding speed of the powder;

[0047] The screening box 5 is fixedly connected to the lower end of the quantitative feeding mechanism 4, and the lower end of the screening box 5 is also fixedly connected to a collecting box 6. A sealing cover 51 is provided at the right end of the screening box 5, and the quantitative feeding mechanism 4, the screening box 5 and the collecting box 6 are interconnected;

[0048] The powder processing mechanism 7 includes a screening part 71, which is arranged inside the screening box 5. The screening box 5 is also provided with an oscillating part 72. The front and rear ends of the screening box 5 are provided with a cleaning part 73. The collecting box 6 is provided with a de-impurity part 74.

[0049] In this embodiment, the design of the quantitative feeding mechanism 4 ensures a stable supply of screening materials by accurately controlling the feeding speed of the powder. Below the quantitative feeding mechanism 4, the screening box 5 plays a vital role. The screening box 5 can not only effectively screen out impurities in the powder, but also has a reasonable structural design and is easy to clean and maintain.

[0050] A sealing cover 51 is provided at the right end of the screening box 5 to facilitate cleaning and inspection of the interior of the screening box 5 .

[0051] The screening part 71 is the core component of the screening box 5, and can effectively screen out large particles of impurities in the powder.

[0052] The presence of the oscillating part 72 inside the screening box 5 makes the screening process more efficient. The oscillating part 72 vibrates the adhering powder away through the vibration generated, thereby preventing blockage and improving the screening efficiency.

[0053] Cleaning parts 73 are provided at the front and rear ends of the screening box 5 to remove the attached powder by generating airflow, thereby maintaining the cleanliness and screening efficiency of the screening part 71.

[0054] The collecting box 6 is provided with a cleaning part 74 for secondary processing of the sieved powder. The cleaning part 74 uses magnetic attraction to completely remove impurities such as iron filings and metal particles in the powder to ensure the purity and quality of the metal powder.

[0055] It should be added that a cavity is opened on the screening box 5, and an electric heating rod (not shown in the figure) is arranged in the cavity, which is used to heat the inside of the screening box 5 and remove moisture from the powder; wherein, the electric heating rod adopts a product currently available on the market. When selecting the model, it should be selected as much as possible to meet the requirements of this application under the premise of suitable specifications and usage scenarios. The specific model specifications are not limited here.

[0056] Next, please refer to Figure 3-Figure 6 The quantitative unloading mechanism 4 includes a unloading shell 401, which is connected to the lower end of the guide hopper 3. A first rotating rod 402 is rotatably connected to the unloading shell 401, and a guide plate 403 is connected to the outer wall of the first rotating rod 402 in a ring-shaped manner. A driving motor 404 is fixedly installed on one side of the unloading shell 401, and the output shaft of the driving motor 404 is fixedly connected to one end of the first rotating rod 402, and a driving gear 405 is fixedly installed on the other end of the first rotating rod 402; the quantitative unloading mechanism 4 also includes a round rod 406, which is fixedly connected to the inner walls of the left and right sides of the unloading shell 401, and a round tube 407 is rotatably sleeved on the outer wall of the round rod 406, wherein the guide plate 403 is a plastic elastic plate.

[0057] In this embodiment, the quantitative feeding mechanism 4 drives the first rotating rod 402 to rotate by starting the driving motor 404. The first rotating rod 402 is connected to the guide plate 403, and the rotating first rotating rod 402 drives the guide plate 403 to rotate together. This rotation action acts on the powder between the two guide plates 403 to transport the powder to the lower end. With the help of the gravity of the powder itself, once the powder is transported to the lower end of the guide plate 403, it will fall down, thereby achieving quantitative transportation of the powder. This mechanism ensures that the screening device can feed continuously and evenly, avoiding repeated screening and unnecessary waste of energy caused by excessive feeding.

[0058] It is worth mentioning that the guide plate 403 is an elastic plate made of plastic. When the circular tube 407 below contacts it, the guide plate 403 will be deformed and vibrate due to the impact force of the circular tube 407. This vibration helps to shake off the powder remaining on the guide plate 403, prevent the adhesion and residue of the powder, and thus keep the equipment clean. At the same time, the circular tube 407 is a rotatable component installed on the round rod 406. When the circular tube 407 contacts the guide plate 403 and generates friction, the circular tube 407 can rotate to reduce friction, reduce wear, and thus extend the service life of the guide plate 403.

[0059] Secondly, please also refer to Figure 6-Figure 9The screening part 71 includes a screening drum 711, which is rotatably arranged in the screening box 5. The left end of the screening box 5 is rotatably connected to the second rotating rod 712, and the right end of the second rotating rod 712 is fixedly connected to the inner wall of the screening drum 711 by a support rod. The left end of the second rotating rod 712 is fixedly installed with a first transmission gear 713. The left end of the screening box 5 is provided with a feeding channel 714, and the upper end of the feeding channel 714 is connected to the unloading shell 401. The inner wall of the screening drum 711 is connected with a metal elastic plate 715 in an annular shape; wherein the oscillating part 72 includes a cylinder 721, which is rotatably sleeved on the outer wall of the second rotating rod 712, and one end of the cylinder 721 is fixedly connected to the inner wall of the screening box 5, and the cylinder 721 is connected with fixed rods 722 in an array, and one end of the fixed rod 722 is fixedly connected to a ball 723.

[0060] In this embodiment, the powder is guided into the screening drum 711 along the feeding channel 714. The driving gear 405 is connected to the first transmission gear 713 and the second transmission gear 744 through a toothed belt transmission, driving the second rotating rod 712 and the third rotating rod 741 to rotate synchronously with the first rotating rod 402. The rotation of the second rotating rod 712 drives the screening drum 711 to rotate, and the powder inside is screened. During the screening process, the rotation of the screening drum 711 drives the powder to rotate together to prevent the powder from piling up. At the same time, the metal elastic plate 715 provided on the inner wall of the screening drum 711 will hit the ball 723 during the rotation process, so that the metal elastic plate 715 and the screening drum 711 vibrate to prevent the powder from adhering to the screening drum 711.

[0061] Next, please refer to Figure 6-Figure 9 The cleaning part 73 includes two air storage pipes 731, which are respectively arranged at the front and rear ends of the screening box 5, and the sides of the two air storage pipes 731 close to each other are provided with nozzles distributed in an array, and the left end of the screening box 5 is fixedly connected with two air cylinders 732, and the two air cylinders 732 are connected with air supply pipes 733, and the air supply pipe 733 is connected with a shunt pipe 734, and the other end of the shunt pipe 734 is connected with the air storage pipe 731, and the ends of the two air cylinders 732 close to each other are piston-type plugged with movable rods 735, and the ends of the two movable rods 735 away from each other are fixedly connected with piston plates 736, and the ends of the two movable rods 735 close to each other are fixedly connected with elliptical rings 737, and the left end outer wall of the second rotating rod 712 is fixedly sleeved with a lever 738.

[0062] In this embodiment, the first rotating rod 402 rotates while driving the lever 738 to rotate. The rotation of the lever 738 relies on the resistance force to move the elliptical ring 737, which in turn drives the movable rod 735 to move. The movement of the movable rod 735 drives the piston plate 736. The movement of the piston plate 736 compresses the air inside the gas cylinder 732. The compressed gas is discharged into the gas storage pipe 731 along the gas delivery pipe 733 and the diverter pipe 734, and finally sprayed out from the nozzle on the gas storage pipe 731 to impact and clean the screening cylinder 711, prevent the powder from clogging the sieve holes on the screening cylinder 711, and ensure the screening efficiency.

[0063] Please refer again Figure 6 and Fig.10 The impurity removing part 74 includes a third rotating rod 741, which is rotatably arranged on the collecting box 6, and the outer wall of the third rotating rod 741 is provided with turning plates 742 in an array, and the inner walls of the front and rear sides of the collecting box 6 are both connected with electromagnetic plates 743 in an array, and one end of the third rotating rod 741 is fixedly connected with a second transmission gear 744, and the lower end of the collecting box 6 is pulled out and plugged with a baffle 745.

[0064] In this embodiment, after the screening process is completed, the fine powder particles will fall along the set path and enter the collection box 6. At this moment, the electromagnetic plate 743 is activated by powering it on, and the electromagnetic plate 743 immediately exerts its magnetism to generate a strong suction field. It specifically attracts and captures the ferromagnetic impurities hidden in the powder, ensuring the purity of the powder. The design of the electromagnetic plate 743 adopts a wavy shape, which increases the contact area with the powder material, so that it can work more efficiently in the process of adsorbing impurities, greatly improving the adsorption efficiency.

[0065] At the same time, the third rotating rod 741 starts to rotate. Its rotation drives the rotation of the flipping plate 742, which effectively disturbs the powder layer, so that the powder that was previously tightly packed together due to screening can be redistributed and loosened. This flipping not only increases the contact opportunity between the powder and the electromagnetic plate 743, but also ensures that the powder material can contact the electromagnetic plate 743 more evenly, further improving the effect of impurity removal.

[0066] Please refer again Figure 6 and Figure 4 One end of the baffle 745 is fixedly connected to a sealing plate, and a handle is also connected to the sealing plate. A slide groove is provided at the lower end of the collection box 6. The baffle 745 is slidably connected in the slide groove provided at the lower end of the collection box 6, and a rubber pad is provided in the slide groove. The rubber pad is provided inside the slide groove, which can not only improve the sealing performance, but also increase the damping effect, ensure the tightness of the baffle 745 inserted in the collection box 6, and prevent the baffle 745 from moving at will.

[0067] Please refer again Figure 6 The diameter of the screening cylinder 711 gradually increases from the left end to the right end, so that the blocked large particles of powder can roll to the right under the action of their own gravity, which is convenient for subsequent cleaning.

[0068] The working principle of the present invention is as follows: first, the substrate is horizontally mounted on the workbench 1, and then a laser cladding forming or 3D printing forming process is performed on the substrate. During the forming process, the residual metal powder will naturally fall through the through hole on the workbench 1 and enter the guide hopper 3, and then flow into the quantitative feeding mechanism 4 along the guide hopper 3.

[0069] The quantitative feeding mechanism 4 drives the first rotating rod 402 to rotate by the driving motor 404 to realize the quantitative delivery of powder. When the first rotating rod 402 rotates, the guide plate 403 rotates accordingly, so that the powder stored between the two guide plates 403 can be transported. When the powder is rotated to the lower end, its dead weight will cause the powder to fall naturally, thereby realizing the quantitative delivery of the powder, ensuring that the screening process can continuously and evenly receive the powder, and effectively avoiding repeated screening and energy waste caused by excessive feeding. In addition, the guide plate 403 is made of plastic elastic material. When it contacts the round tube 407, it will deform and vibrate, thereby shaking off the powder that may remain on the guide plate 403, maintaining the cleanliness of the equipment. At the same time, the round tube 407 is connected to the round rod 406 by rotation, and can rotate when in contact with the guide plate 403, reducing friction, reducing wear, and extending the service life of the guide plate 403.

[0070] Subsequently, the powder enters the screening drum 711 through the feeding channel 714. The driving gear 405 is connected to the first transmission gear 713 and the second transmission gear 744 through a toothed belt drive, thereby driving the second rotating rod 712 and the third rotating rod 741 to rotate synchronously with the first rotating rod 402. The rotation of the second rotating rod 712 drives the screening drum 711 to perform rotary screening. During the screening process, the rotation of the screening drum 711 allows the powder to rotate evenly, thereby preventing the accumulation of the powder. At the same time, the metal elastic plate 715 on the inner wall of the screening drum 711 hits the ball 723 during the rotation process, causing the metal elastic plate 715 to vibrate, and the vibration is transmitted to the screening drum 711, effectively preventing the adhesion of the powder.

[0071] During the rotation of the first rotating rod 402, the lever 738 also rotates, and pushes the elliptical ring 737 to move through the resistance force. The movement of the elliptical ring 737 drives the movement of the movable rods 735 fixedly connected on both sides thereof, and then drives the piston plate 736 to move in the gas cylinder 732, compressing the air in the gas cylinder 732. Subsequently, the compressed gas is discharged into the gas storage pipe 731 through the gas delivery pipe 733 and the diverter pipe 734, and finally sprayed out through the nozzle on the gas storage pipe 731, impact cleaning the screening cylinder 711, preventing the powder from clogging the sieve holes and ensuring the screening effect.

[0072] The sieved powder finally falls into the collection box 6. At this time, the electromagnetic plate 743 is energized, and the suction force generated by the electromagnetic plate 743 will effectively absorb the ferromagnetic impurities in the powder, thereby ensuring the purity of the powder. The wavy design of the electromagnetic plate 743 increases the contact area with the powder, further improving the adsorption effect. At the same time, the rotation of the third rotating rod 741 drives the rotation of the flipping plate 742, and the flipping of the flipping plate 742 ensures that the powder is in full contact with the electromagnetic plate 743, thereby ensuring the impurity removal effect.

[0073] After the processing is completed, the staff will pull out the baffle 745 to discharge and store the screened powder for subsequent use; then the electromagnetic plate 743 will be powered off, and the electromagnetic plate 743 will lose its suction, and the adsorbed ferromagnetic impurities will be discharged; and the sealing cover 51 at the right end of the screening box 5 will be opened to clean out the impurities blocked in the screening cylinder 711.

[0074] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. An additive manufacturing device based on a digital model, comprising a workbench (1), a support frame (2) being arranged at the lower end of the workbench (1), and a guide hopper (3) being fixedly connected to the lower end of the workbench (1), characterized in that: Also includes: A quantitative feeding mechanism (4), the quantitative feeding mechanism (4) being arranged at the lower end of the guide hopper (3) and being used to control the feeding speed of the powder; A screening box (5), the screening box (5) being fixedly connected to the lower end of the quantitative feeding mechanism (4); A powder processing mechanism (7), the powder processing mechanism (7) comprising a screening part (71), the screening part (71) being arranged inside a screening box (5), the screening box (5) also being provided with an oscillating part (72), and the front and rear ends of the screening box (5) being provided with cleaning parts (73); The quantitative material discharge mechanism (4) comprises a material discharge shell (401), the material discharge shell (401) is connected to the lower end of the material guide hopper (3), a first rotating rod (402) is rotatably connected to the material discharge shell (401), and a material guide plate (403) is connected to the outer wall of the first rotating rod (402) in an annular shape; The screening part (71) comprises a screening drum (711), the screening drum (711) being rotatably arranged in a screening box (5), the left end of the screening box (5) being rotatably connected to a second rotating rod (712), and the right end of the second rotating rod (712) being fixedly connected to the inner wall of the screening drum (711) by means of a supporting rod, the left end of the second rotating rod (712) being fixedly mounted with a first transmission gear (713), the left end of the screening box (5) being provided with a material conveying channel (714), and the upper end of the material conveying channel (714) being communicated with a material discharge shell (401), and the inner wall of the screening drum (711) being connected to a metal elastic plate (715) in an annular arrangement; The oscillating portion (72) comprises a cylinder (721), the cylinder (721) being rotatably sleeved on the outer wall of the second rotating rod (712), and one end of the cylinder (721) being fixedly connected to the inner wall of the screening box (5), the cylinder (721) being connected to fixed rods (722) distributed in an array, and one end of the fixed rods (722) being fixedly connected to a ball (723).

2. The additive manufacturing device based on a digital model according to claim 1, characterized in that: The lower end of the screening box (5) is also fixedly connected to a collecting box (6), the interior of the collecting box (6) is provided with a debris removal portion (74), the right end of the screening box (5) is provided with a sealing cover (51), and the quantitative unloading mechanism (4), the screening box (5) and the collecting box (6) are interconnected, a driving motor (404) is fixedly mounted on one side of the unloading shell (401), and the output shaft of the driving motor (404) is fixedly connected to one end of the first rotating rod (402), and a driving gear (405) is fixedly mounted on the other end of the first rotating rod (402).

3. The digital model-based additive manufacturing device according to claim 1, characterized in that: The cleaning portion (73) comprises two air storage pipes (731), the two air storage pipes (731) are respectively arranged at the front and rear ends of the screening box (5), and nozzles are arranged in an array on the sides of the two air storage pipes (731) close to each other. The left end of the screening box (5) is fixedly connected to two air cylinders (732), the two air cylinders (732) are connected to air supply pipes (733), the air supply pipes (733) are connected to a shunt pipe (734), and the other end of the shunt pipe (734) is connected to the air storage pipe (731), the ends of the two air cylinders (732) close to each other are piston-connected with movable rods (735), the ends of the two movable rods (735) away from each other are fixedly connected with piston plates (736), the ends of the two movable rods (735) close to each other are fixedly connected with elliptical rings (737), and the left end outer wall of the second rotating rod (712) is fixedly sleeved with a shifting rod (738).

4. The additive manufacturing device based on a digital model according to claim 2, characterized in that: The impurity removing portion (74) comprises a third rotating rod (741), the third rotating rod (741) being rotatably arranged on the collecting box (6), the outer wall of the third rotating rod (741) being provided with turning plates (742) distributed in an array, the inner walls on both the front and rear sides of the collecting box (6) being connected with electromagnetic plates (743) distributed in an array, one end of the third rotating rod (741) being fixedly connected with a second transmission gear (744), and the lower end of the collecting box (6) being pull-out plugged with a baffle plate (745).

5. The digital model-based additive manufacturing device according to claim 4, characterized in that: One end of the baffle plate (745) is fixedly connected to a sealing plate, and the sealing plate is also connected to a handle. A sliding groove is provided at the lower end of the collection box (6). The baffle plate (745) is slidably connected in the sliding groove provided at the lower end of the collection box (6), and a rubber pad is provided in the sliding groove.

6. The digital model-based additive manufacturing device according to claim 1, characterized in that: The quantitative material discharging mechanism (4) further comprises a round rod (406), wherein the round rod (406) is fixedly connected to the left and right inner walls of the material discharging shell (401), and a round tube (407) is rotatably sleeved on the outer wall of the round rod (406), wherein the material guide plate (403) is a plastic elastic plate.

7. The digital model-based additive manufacturing device according to claim 1, characterized in that: The screening cylinder The diameter of (711) gradually increases from the left end to the right end.

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