Laser additive manufacturing forming equipment

Abstract

The invention provides laser additive manufacturing forming equipment, which relates to the technical field of laser rapid forming and comprises a machine body, a powder laying platform is arranged in the machine body, a powder laying mechanism is arranged on the powder laying platform, a powder feeding cylinder, a forming cylinder and a first recycling cylinder are sequentially arranged at the bottom of the powder laying platform, and a laser unit is arranged above the forming cylinder. According to the powder spreading device, the powder spreading mechanism can push redundant powder into the first recovery cylinder, the redundant powder is collected through the first recovery cylinder, the redundant powder is prevented from remaining on the powder spreading platform, and the powder is fully recovered.

Description

Technical Field

[0001] The present invention relates to the technical field of laser rapid prototyping, and in particular to a laser additive manufacturing device. Background Art

[0002] Laser additive manufacturing technology is a forming processing technology that uses laser as a heat source. It can use its own characteristics to achieve rapid preparation of complex material compositions and structures. It is widely used in aerospace, biomedicine, energy, automobile and other fields. Laser additive manufacturing equipment uses a laser beam to scan the powder material layer by layer and sinter it into shape by spot welding. As the scanning light spot moves, the powder material continues to sinter together and gradually forms a three-dimensional object, which can be used to manufacture porous materials. This manufacturing process realizes one-time molding from digital models to actual products, reducing manufacturing costs and time, and greatly improving product quality and production efficiency.

[0003] A Chinese patent with authorization announcement number CN119140848B discloses an additive manufacturing molding device, including a machine body, a powder spreading unit, a laser unit and a molding unit, wherein the powder spreading unit includes: a powder box fixedly installed inside the machine body; a feeding assembly installed in the No. 2 cavity; a stirring assembly installed in the No. 2 cavity; a receiving plate installed in the machine body; a powder spreading platform fixedly installed in the machine body; a side plate fixedly installed inside the machine body, on which a leveling assembly is slidably installed; by setting the stirring assembly, the powder coming out of the storage chamber on the discharge station is dispersed, even if the position where the storage chamber of the discharge station and the storage chamber of the feeding station are connected is blocked, the powder can still be evenly dispersed in the storage chamber after entering the storage chamber of the feeding station, so that after the powder falls onto the receiving plate under the action of gravity, it can be evenly distributed on the receiving plate along the direction of the discharge port.

[0004] However, in the process of leveling the powder of the leveling component, excess powder will remain on the powder spreading platform, resulting in a waste of powder. Summary of the invention

[0005] The present invention provides a laser additive manufacturing forming device, which is used to solve the technical problem that in the process of leveling powder of a leveling component of the current additive manufacturing forming device, excess powder will remain on the powder spreading platform, causing waste of powder.

[0006] In order to solve the above technical problems, the present invention discloses a laser additive manufacturing forming equipment, including: a machine body, a powder spreading platform is arranged in the machine body, a powder spreading mechanism is arranged on the powder spreading platform, a powder feeding cylinder, a forming cylinder and a first recovery cylinder are arranged in sequence at the bottom of the powder spreading platform, and a laser unit is arranged above the forming cylinder.

[0007] Preferably, an observation window is provided on the front side of the machine body.

[0008] Preferably, the powder spreading mechanism includes a trowel plate, the lower surface of which is slidably connected to the upper surface of the powder spreading platform, a threaded hole is arranged on one side of the trowel plate, a driving motor is arranged in the body, a screw is arranged at the output end of the driving motor, and the trowel plate is threadedly connected to the outer wall of the screw through the threaded hole.

[0009] Preferably, the powder feeding cylinder is connected to the bottom wall of the machine body through a first mounting bracket, and the forming cylinder is connected to the bottom wall of the machine body through a second mounting bracket.

[0010] Preferably, a second recovery cylinder is arranged on a side of the powder feeding cylinder away from the forming cylinder.

[0011] Preferably, a recovery mechanism is provided in the machine body, the recovery mechanism comprises a recovery box, a first spiral conveying pipeline is provided on one side of the recovery box, and the lower ends of the first recovery cylinder and the second recovery cylinder are both connected to the first spiral conveying pipeline.

[0012] Preferably, the recycling mechanism also includes a powder box, which is arranged above the forming cylinder and connected to the inner wall of the machine body. A second spiral conveying pipe is arranged between the powder box and the recycling box. A stirring shaft is arranged in the powder box. The upper end of the stirring shaft extends to the outside of the powder box and a stirring motor is arranged. A plurality of breaking strips are arranged outside the stirring shaft. A discharge port is arranged at the bottom of the powder box, and a powder feeding assembly is arranged at the discharge port.

[0013] Preferably, a screen is arranged below the breaking bar, the screen is arranged in a screening frame, and the outer wall of the screening frame is connected to the inner wall of the powder box.

[0014] Preferably, a guide ring is provided on the screening frame, and an inclined surface is provided on the inner side of the guide ring.

[0015] Preferably, the lower end of the stirring shaft extends to below the screen and is provided with a scraper.

[0016] The technical solution of the present invention has the following advantages: The present invention provides a laser additive manufacturing forming device, which relates to the field of laser rapid forming technology, including a machine body, a powder spreading platform is arranged in the machine body, a powder spreading mechanism is arranged on the powder spreading platform, a powder feeding cylinder, a forming cylinder and a first recovery cylinder are arranged in sequence at the bottom of the powder spreading platform, and a laser unit is arranged above the forming cylinder. In the present invention, the powder spreading mechanism can push excess powder into the first recovery cylinder, collect excess powder through the first recovery cylinder, avoid excess powder remaining on the powder spreading platform, and fully recover the powder.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the devices particularly pointed out in the written description and the drawings of the description.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a laser additive manufacturing forming device of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the machine body in the present invention;

[0022] Figure 3 For the present invention Figure 2 A magnified view of the structure at center;

[0023] Figure 4 This is a top view of the powder delivery pipe in the present invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of the powder box in the present invention;

[0025] Figure 6 For the present invention Figure 5 A magnified view of the structure at B in the middle;

[0026] Figure 7 A top view of the rotating ring in the present invention;

[0027] Figure 8 It is a side view of the strips in the present invention;

[0028] Fig. 9 It is a schematic diagram of the adjustment block in the present invention.

[0029] In the figure: 1, machine body; 2, powder spreading platform; 3, powder feeding cylinder; 4, forming cylinder; 5, first recovery cylinder; 6, smear plate; 7, driving motor; 8, screw; 9, first mounting bracket; 10, second mounting bracket; 11, second recovery cylinder; 12, recovery box; 13, first spiral conveying pipeline; 14, powder box; 15, second spiral conveying pipeline; 16, stirring shaft; 17, stirring motor; 18, scattering bar; 19, discharge port; 20, screen; 21, screening frame; 22, guide Guide ring; 23, scraper; 24, powder delivery pipe; 25, first baffle; 26, first through hole; 27, contact plate; 28, connecting plate; 29, connecting spring; 30, second baffle; 31, second through hole; 32, rotating ring; 33, gear ring; 34, rotating motor; 35, rotating shaft; 36, driving gear; 37, adjusting block; 38, mounting cylinder; 39, connecting column; 40, compression spring; 41, ball; 42, first sliding ring; 43, second sliding ring; 44, scraper strip. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] Example 1

[0033] The embodiment of the present invention provides a laser additive manufacturing forming device, such as Figure 1-Figure 9 As shown, it includes: a machine body 1, a powder spreading platform 2 is arranged inside the machine body 1, a powder spreading mechanism is arranged on the powder spreading platform 2, a powder feeding cylinder 3, a forming cylinder 4 and a first recovery cylinder 5 are arranged in sequence at the bottom of the powder spreading platform 2, and a laser unit is arranged above the forming cylinder 4.

[0034] The working principle and beneficial effects of the above technical solution are as follows: the front and rear side walls of the powder spreading platform 2 are fixedly connected to the inner wall of the machine body 1, a plurality of rectangular through holes are arranged on the powder spreading platform 2, and the powder feeding cylinder 3, the forming cylinder 4 and the first recovery cylinder 5 are installed in different rectangular through holes from left to right in sequence, a laser unit is arranged above the forming cylinder 4, the laser unit includes a plurality of laser emitters, the laser emitters are arranged on the inner wall of the upper end of the machine body 1, the output end of the laser emitter faces the forming cylinder 4, the laser emitter can emit a laser beam to the forming cylinder 4, a first push plate is arranged in the powder feeding cylinder 3, the metal powder required for manufacturing the product is pre-stored on the first push plate, a first push rod is arranged on the lower side of the first push plate, and the first push rod can push the first push plate to slide upward along the inner wall of the powder feeding cylinder 3, A second push plate is arranged in the forming cylinder 4, and a second push rod is arranged at the lower side of the second push plate. The second push rod can pull the second push plate to slide in the forming cylinder 4. When preparing products through the laser additive manufacturing forming equipment, the first push plate is pushed upward by a preset distance, and then the powder spreading mechanism spreads the powder in the powder feeding cylinder 3 on the forming cylinder 4. The laser emitter emits a laser beam to scan the cross section of the product plane layer on the powder at the forming cylinder 4. The powder is irradiated by the laser beam and melts and solidifies quickly. Then the second push plate is controlled to move downward, and the powder is spread again by the powder spreading mechanism. By analogy, each plane layer of the product is quickly printed from bottom to top, and the rapid manufacturing of the product can be completed. Both the first push rod and the second push rod can use electric push rods. During the powder spreading process, the powder spreading mechanism can push the excess powder into the first recovery cylinder 5, collect the excess powder through the first recovery cylinder 5, avoid the excess powder from remaining on the powder spreading platform 2, and make the powder recovered into the first recovery cylinder 5, so as to achieve the effect of saving resources.

[0035] Example 2

[0036] On the basis of the above-mentioned embodiment 1, an observation window is provided on the front side of the machine body 1 .

[0037] The working principle and beneficial effects of the above technical solution are: the laser additive manufacturing process of the product can be intuitively observed through the observation window, so that equipment problems can be discovered and handled in time, ensuring the normal operation of the laser additive manufacturing forming equipment.

[0038] Example 3

[0039] On the basis of Example 1 or 2, Figure 2 , Figure 3 As shown, the powder spreading mechanism includes a trowel plate 6, the lower surface of the trowel plate 6 is slidably connected to the upper surface of the powder spreading platform 2, a threaded hole is arranged on one side of the trowel plate 6, a driving motor 7 is arranged in the body 1, a screw rod 8 is arranged at the output end of the driving motor 7, and the trowel plate 6 is threadedly connected to the outer wall of the screw rod 8 through the threaded hole.

[0040] The working principle and beneficial effects of the above technical solution are as follows: when the powder spreading mechanism spreads powder, the driving motor 7 is started to drive the screw 8 to rotate, and the rotation of the screw 8 drives the screed plate 6 to slide along the surface of the powder spreading platform 2, and the screed plate 6 can spread the powder at the powder feeding cylinder 3 to the forming cylinder 4, and then the screed plate 6 continues to slide, and the excess powder can be pushed into the first recovery cylinder 5 to complete the recovery of the excess powder.

[0041] Example 4

[0042] On the basis of any one of Examples 1-3, Figure 2 As shown, the powder feeding cylinder 3 is connected to the bottom wall of the machine body 1 through a first mounting bracket 9 , and the forming cylinder 4 is connected to the bottom wall of the machine body 1 through a second mounting bracket 10 .

[0043] The working principle and beneficial effects of the above technical solution are as follows: the powder feeding cylinder 3 is arranged on the first mounting bracket 9 to facilitate the installation of the first push rod, and the forming cylinder 4 is arranged on the second mounting bracket 10 to facilitate the installation of the second push rod.

[0044] Example 5

[0045] On the basis of any one of Examples 1-4, Figure 2 As shown, a second recovery cylinder 11 is arranged on the side of the powder feeding cylinder 3 away from the forming cylinder 4 .

[0046] The working principle and beneficial effects of the above technical solution are as follows: when the driving motor 7 rotates in the opposite direction, it can drive the trowel plate 6 to move away from the driving motor 7. When the trowel plate 6 passes over the forming cylinder 4 and the powder feeding cylinder 3, it can scrape the powder flat and scrape the excess powder into the second recovery cylinder 11. On the one hand, it ensures the flatness of the powder on the forming cylinder 4 and the powder feeding cylinder 3, and ensures the accuracy of subsequent powder spreading. On the other hand, it can recover the excess powder into the second recovery cylinder 11, further recovering the powder and saving resources.

[0047] Example 6

[0048] On the basis of Example 5, Figure 2 As shown, a recovery mechanism is arranged in the machine body 1, and the recovery mechanism includes a recovery box 12, a first spiral conveying pipe 13 is arranged on one side of the recovery box 12, and the lower ends of the first recovery cylinder 5 and the second recovery cylinder 11 are both connected to the first spiral conveying pipe 13.

[0049] The working principle and beneficial effects of the above technical solution are as follows: the powder recovered to the first recovery cylinder 5 and the second recovery cylinder 11 can fall into the first spiral conveying pipe 13, and a first spiral conveying device is arranged in the first bolt conveying pipe. The first spiral conveying device includes a first spiral blade, and the powder in the first spiral conveying pipe 13 can be conveyed to the recovery box 12 through the first spiral blade, thereby completing the unified recovery of the powder.

[0050] Example 7

[0051] On the basis of Example 6, Figure 2 , Figure 5 As shown, the recovery mechanism also includes a powder box 14, which is arranged above the forming cylinder 4, and the powder box 14 is connected to the inner wall of the machine body 1, and a second spiral conveying pipe 15 is arranged between the powder box 14 and the recovery box 12, and a stirring shaft 16 is arranged in the powder box 14, and the upper end of the stirring shaft 16 extends to the outside of the powder box 14 and is provided with a stirring motor 17, and a plurality of breaking strips 18 are arranged outside the stirring shaft 16, and a discharge port 19 is arranged at the bottom of the powder box 14, and a powder feeding component is arranged at the discharge port 19.

[0052] The working principle and beneficial effects of the above technical scheme are as follows: a powder box 14 is also arranged on the powder spreading platform 2, and the powder box 14 is connected to the recovery box 12 through a second spiral conveying pipe 15, and a second spiral conveying device is arranged in the second spiral conveying pipe 15, and the second spiral conveying device includes a second spiral blade, and the second spiral blade is driven by the motor to rotate, so that the powder recovered in the recovery box 12 can be transported to the powder box 14, and the stirring motor 17 can start to drive the stirring shaft 16 to rotate, and the rotation of the stirring shaft 16 drives the scattering bar 18 to rotate, and the scattering bar 18 can scatter the powder in the powder box 14, and then spread it evenly to the powder feeding cylinder 3 through the powder feeding component at the discharge port 19, and when the smearing plate 6 moves in the direction of the driving motor 7, the smearing plate 6 can evenly spread the powder on the powder feeding cylinder 3 on the forming cylinder 4, and the discharge port 19 is in the shape of a long strip, and the length of the discharge port 19 is the same as the length of the upper end cylinder mouth of the powder feeding cylinder 3, so as to ensure that the powder falling from the discharge port 19 is in the shape of a long strip, and through the above scheme, the recycling and reuse of the powder is realized, and the effect of saving resources is further achieved.

[0053] Example 8

[0054] On the basis of Example 7, Figure 5 As shown, a screen 20 is arranged below the scattering bar 18 , and the screen 20 is arranged in a screening frame 21 , and the outer wall of the screening frame 21 is connected to the inner wall of the powder box 14 .

[0055] The working principle and beneficial effects of the above technical solution are as follows: the powder dispersed by the dispersing bar 18 falls under the screen 20 after screening by the screen 20, and the powders that stick to each other are intercepted by the screen 20 to prevent the sticky powders from flowing out of the discharge port 19, thereby improving the quality of the powder flowing out of the discharge port 19.

[0056] Example 9

[0057] On the basis of Example 8, Figure 5 As shown, a guide ring 22 is provided on the screening frame 21 , and an inclined surface is provided inside the guide ring 22 .

[0058] The working principle and beneficial effects of the above technical solution are as follows: the outer wall of the guide ring 22 is slidably connected to the inner wall of the powder box 14 up and down, and the guide ring 22 can guide the powder to fall on the screen 20 to avoid powder residue on the surface of the screening frame 21.

[0059] Example 10

[0060] On the basis of Example 8 or 9, Figure 5 As shown, the lower end of the stirring shaft 16 extends to below the screen 20 and is provided with a scraper 23.

[0061] The working principle and beneficial effects of the above technical solution are as follows: the rotation of the stirring shaft 16 can drive the scraper 23 to rotate, and the scraper 23 can scrape the powder into the discharge port 19 so that the powder fills the discharge port 19 .

[0062] Embodiment 11

[0063] On the basis of Example 10, Figure 2-Figure 5 As shown, the powder feeding assembly includes a powder feeding pipe 24, the upper end of the powder feeding pipe 24 is connected to the discharge port 19, the left and right side walls of the powder feeding pipe 24 are provided with openings, a first baffle 25 is slidably provided in the opening, a first through hole 26 is provided in the first baffle 25, the first through hole 26 is connected to the inside of the powder feeding pipe 24, a contact plate 27 is provided at the end of the first baffle 25 away from the forming cylinder 4, the upper end of the contact plate 27 is slidably connected to the bottom wall of the powder box 14 left and right, the lower end of the contact plate 27 extends to above the screw 8, the first baffle 25 extends to the right side of the powder feeding pipe 24 away from the end of the contact plate 27 and a connecting plate 28 is provided, the connecting plate 28 is connected to the right side wall of the powder feeding pipe 24 through a connecting spring 29, a second baffle 30 is provided at the lower end of the connecting plate 28, one end of the second baffle 30 extends to below the first through hole 26 and blocks the lower end of the powder feeding pipe 24, and a second through hole 31 is provided in the second baffle 30.

[0064] The working principle and beneficial effects of the above technical solution are as follows: the powder feeding tube 24 is designed in a long strip shape, the upper end of the powder feeding tube 24 is adapted to the discharge port 19, the first through hole 26 and the second through hole 31 are staggered, initially, the first through hole 26 is connected to the powder feeding tube 24, the lower end of the powder feeding tube 24 is blocked by the second baffle 30, the powder in the powder box 14 can flow into the powder feeding tube 24 through the discharge port 19, and under the action of the scraper 23, the powder fills the powder feeding tube 24, when the trowel plate 6 moves toward the second recovery cylinder 11, the upper end of the trowel plate 6 gradually contacts with the contact plate 27, and drives the contact plate 27 to move toward the second recovery cylinder 11, the contact plate 27 drives the first baffle 25 to move, so that the first through hole 26 is separated from the powder feeding tube 24, and the powder in the first through hole 26 will fall on the second baffle 30, and at the same time, the first baffle 25 is connected to the second recovery cylinder 11. The connecting plate 28 drives the second baffle plate 30 to slide toward the second recovery cylinder 11, and the connecting spring 29 is compressed. When the trowel plate 6 pushes the powder into the second recovery cylinder 11, the second through hole 31 is aligned with the lower end of the powder feeding tube 24, and the powder between the first baffle plate 25 and the second baffle plate 30 can fall onto the powder feeding cylinder 3 through the second through hole 31, and then the driving motor 7 controls the trowel plate 6 to slide toward the driving motor 7. Under the action of the connecting spring 29, the first baffle plate 25 and the second baffle plate 30 return to their original positions. At this time, the powder falling on the second baffle plate 30 can be scraped onto the powder feeding cylinder 3 through the powder feeding tube 24. When the trowel plate 6 passes by, the powder on the powder feeding cylinder 3 is evenly spread onto the forming cylinder 4. In this process, the powder flowing out of the discharge port 19 can fully fill the powder feeding tube 24, thereby ensuring the reliability of the powder feeding tube 24 in conveying powder to the powder feeding cylinder 3.

[0065] The push-out length of the first push rod can be calculated by the following formula:

[0066]

[0067] Wherein, L1 is the push-out length of the first push rod, L2 is the retracted length of the second push rod, S2 is the cylinder mouth area of ​​the forming cylinder 4, V1 is the volume of the first through hole 26, S3 is the cross-sectional area inside the powder delivery pipe 24, L3 is the distance from the lower surface of the first baffle 25 to the upper surface of the second baffle 30, and S1 is the cylinder mouth area of ​​the powder delivery cylinder 3;

[0068] A first distance sensor is arranged on the first push rod, a second distance sensor is arranged on the second push rod, and a controller is also arranged in the machine body 1, and the controller is electrically connected to the first push rod, the second push rod, the first distance sensor, and the second distance sensor respectively. The retracted length of the second push rod can be obtained through the second distance sensor, and the extension length of the first push rod can be accurately calculated through the retracted length of the second push rod. Then the controller can control the first push rod to be extended, so that the actual extension length of the first push rod is equal to the calculated extension length of the first push rod, thereby ensuring the accurate powder delivery amount of the powder delivery cylinder 3, reducing the powder remaining on the powder spreading platform 2, and improving the powder utilization rate.

[0069] Example 12

[0070] On the basis of Example 8 or 9, Figure 5-Figure 9 As shown, a distance adjustment component is arranged below the screening frame 21, and the distance adjustment component includes a rotating ring 32, which is arranged below the screening frame 21, and the outer wall of the rotating ring 32 is rotatably connected to the inner wall of the powder box 14, and a gear ring 33 is arranged on the rotating ring 32, and the outer side of the gear ring 33 is provided with teeth, and a rotating motor 34 is arranged between the screening frame 21 and the rotating ring 32, and the rotating motor 34 is connected to the inner wall of the powder box 14, and a rotating shaft 35 is arranged at the output end of the rotating motor 34, and a driving gear 36 is arranged on the rotating shaft 35, and the driving gear 36 is meshed with the outer side of the gear ring 33, and a plurality of adjustment blocks 37 are arranged on the inner side of the gear ring 33 The adjusting block 37 is arranged on the rotating ring 32, and a plurality of adjusting blocks 37 are distributed in a circular array about the center of the rotating ring 32. A guiding inclined plane is arranged at one end of the adjusting block 37. The longitudinal section of the adjusting block 37 is in the shape of a right-angled trapezoid. A plurality of mounting cylinders 38 are arranged on the lower surface of the screening frame 21, and a plurality of mounting cylinders 38 are distributed in a circular array about the center of the screening frame 21. A connecting column 39 is slidingly arranged in the mounting cylinder 38, and the connecting column 39 is connected to the inner wall of the mounting cylinder 38 through a compression spring 40. The lower end of the connecting column 39 extends to the inner side of the gear ring 33 and is provided with a ball 41, and the ball 41 contacts the upper surface of the rotating ring 32.

[0071] The working principle and beneficial effects of the above technical solution are as follows: the rotation of the rotating motor 34 can drive the driving gear 36 to rotate through the rotating shaft 35, the driving gear 36 rotates to drive the gear ring 33 to rotate, the gear ring 33 rotates to drive the rotating ring 32 to rotate on the inner wall of the powder box 14, and the rotating ring 32 can drive the adjusting block 37 to move synchronously when it rotates. The adjusting block 37 is in the shape of a right-angled trapezoid, and a guide slope is set at one end of the adjusting block 37. The outer wall of the screening frame 21 is connected to the inner wall of the powder box 14 by sliding up and down. When the ball 41 contacts the guide slope, the ball 41 can roll upward along the guide slope and drive the connecting The connecting column 39 slides upward along the inner wall of the installation cylinder 38, and the connecting column 39 drives the installation cylinder 38 to move upward through the compression spring 40. The installation cylinder 38 drives the screening frame 21 to slide upward along the inner wall of the powder box 14. The screening frame 21 drives the screen 20 and the guide ring 22 to slide upward. When the guide ring 22 slides upward, it can scrape off the powder adhered to the inner wall of the powder box 14 to reduce the residual powder. During the upward movement of the screen 20, the distance between the screen 20 and the scattering bar 18 can be reduced. The scattering bar 18 is in the shape of a right-angled trapezoid. A downward pressing slope is set on one side of the scattering bar 18. As the scattering bar 18 and the screen 2 0, the scattering bar 18 can accelerate the collision of powders by pressing down the inclined surface, and squeeze the passing powders to further scatter the powders, thereby reducing the sticky powders remaining on the screen 20. When the ball 41 rolls to the horizontal section of the adjusting block 37, the screen 20 is closest to the scattering bar 18. As the rotating ring 32 rotates, the bottom of the scattering bar 18 contacts the upper surface of the screen 20, which can scrape off the powders stuck on the upper surface of the screen 20 to avoid clogging of the sieve holes of the screen 20. When the ball 41 separates from the horizontal section of the adjusting block 37, the adjusting block 37 is straight. The ball 41 is in the shape of an angular trapezoid and can fall down quickly and contact with the upper surface of the rotating ring 32, thereby driving the screen 20 to fall down quickly and vibrate in a small range under the action of the compression spring 40. The vibration of the screen 20 can not only shake off the powder blocked in the screen hole, thereby ensuring the screening efficiency of the screen 20 and extending the service life of the screen 20, but also can make the powder on the upper surface of the screen 20 turn over, which helps the breaking bar 18 to break up the powder and improves the breaking efficiency. The rotation of the rotating ring 32 accelerates the screening of the recovered powder and improves the uniformity of the powder conveying by the powder feeding pipe 24.

[0072] Embodiment 13

[0073] Based on Example 12, Figure 6 As shown, a first sliding ring 42 is disposed at the bottom of the screening frame 21 , a second sliding ring 43 is slidably disposed on the inner wall of the first sliding ring 42 , and the lower end of the second sliding ring 43 is connected to the upper surface of the rotating ring 32 .

[0074] The working principle and beneficial effects of the above technical solution are as follows: when the rotating ring 32 rotates, the second sliding ring 43 can rotate inside the first sliding ring 42, thereby improving the stability of the rotation of the rotating ring 32, and the second sliding ring 43 can slide up and down along the first sliding ring 42 to prevent powder from entering the first sliding ring 42, thereby ensuring the working environment of the rotating motor 34.

[0075] Embodiment 14

[0076] On the basis of Example 12 or 13, Figure 5 As shown, a plurality of scraping strips 44 are provided on the lower surface of the rotating ring 32 , and one side of the scraping strips 44 contacts the inner wall of the powder box 14 .

[0077] The working principle and beneficial effects of the above technical solution are as follows: when the rotating ring 32 rotates, it can drive the scraper strip 44 to rotate. The scraper strip 44 contacts the inner wall of the powder box 14, and can scrape off the powder adhered to the inner wall of the powder box 14, preventing powder accumulation, reducing the difficulty of cleaning the powder box 14, and extending the service life of the equipment.

[0078] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A laser additive manufacturing equipment, characterized in that: include: A machine body (1) is provided inside the machine body (1), a powder spreading platform (2) is provided on the powder spreading platform (2), a powder spreading mechanism is provided on the powder spreading platform (2), a powder feeding cylinder (3), a forming cylinder (4) and a first recovery cylinder (5) are provided in sequence at the bottom of the powder spreading platform (2), and a laser unit is provided above the forming cylinder (4).

2. The laser additive manufacturing equipment according to claim 1, characterized in that: An observation window is arranged on the front side of the machine body (1).

3. The laser additive manufacturing equipment according to claim 1, characterized in that: The powder spreading mechanism comprises a trowel plate (6), the lower surface of the trowel plate (6) is slidably connected to the upper surface of the powder spreading platform (2), a threaded hole is arranged on one side of the trowel plate (6), a driving motor (7) is arranged in the machine body (1), a screw rod (8) is arranged at the output end of the driving motor (7), and the trowel plate (6) is threadedly connected to the outer wall of the screw rod (8) through the threaded hole.

4. The laser additive manufacturing equipment according to claim 1, characterized in that: The powder delivery cylinder (3) is connected to the bottom wall of the machine body (1) via a first mounting bracket (9), and the forming cylinder (4) is connected to the bottom wall of the machine body (1) via a second mounting bracket (10).

5. The laser additive manufacturing equipment according to claim 1, characterized in that: A second recovery cylinder (11) is arranged on the side of the powder delivery cylinder (3) away from the forming cylinder (4).

6. The laser additive manufacturing equipment according to claim 5, characterized in that: A recovery mechanism is arranged in the machine body (1), the recovery mechanism comprising a recovery box (12), a first spiral conveying pipeline (13) is arranged on one side of the recovery box (12), and the lower ends of the first recovery cylinder (5) and the second recovery cylinder (11) are both connected to the first spiral conveying pipeline (13).

7. The laser additive manufacturing equipment according to claim 6, characterized in that: The recovery mechanism also includes a powder box (14), which is arranged above the forming cylinder (4), the powder box (14) is connected to the inner wall of the machine body (1), a second spiral conveying pipeline (15) is arranged between the powder box (14) and the recovery box (12), a stirring shaft (16) is arranged in the powder box (14), the upper end of the stirring shaft (16) extends to the outside of the powder box (14) and is provided with a stirring motor (17), a plurality of breaking strips (18) are arranged outside the stirring shaft (16), a discharge port (19) is arranged at the bottom of the powder box (14), and a powder feeding component is arranged at the discharge port (19).

8. The laser additive manufacturing equipment according to claim 7, characterized in that: A screen (20) is arranged below the scattering bar (18), and the screen (20) is arranged in a screening frame (21), and the outer wall of the screening frame (21) is connected to the inner wall of the powder box (14).

9. The laser additive manufacturing equipment according to claim 8, characterized in that: A guide ring (22) is arranged on the screening frame (21), and an inclined surface is arranged inside the guide ring (22).

10. The laser additive manufacturing equipment according to claim 8, characterized in that: The lower end of the stirring shaft (16) extends to below the screen (20) and is provided with a scraper (23).

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