Selective laser melting dynamic self-adaptive unsupported printing device

Abstract

The invention belongs to the technical field of additive manufacturing, and particularly relates to a selective laser melting dynamic self-adaptive unsupported printing device which comprises a box body, a scraping mechanism, a powder feeding mechanism, a powder amount control mechanism, a self-adaptive printing mechanism and a powder collecting mechanism. A scraping plate of the scraping mechanism pushes powder provided by the powder feeding mechanism to the position above the powder amount control mechanism, the powder amount control mechanism controls the using amount of the powder, meanwhile, the powder falls into the self-adaptive printing mechanism, the scraping plate of the scraping mechanism pushes the remaining powder into the powder collecting mechanism, a transmission mechanism is arranged at the bottom of the self-adaptive printing mechanism, and the transmission mechanism is connected with the self-adaptive printing mechanism. The transmission mechanism is used for self-adapting to the printing mechanism to generate an inclined state; according to the device, the inclination angle can be dynamically adjusted in the printing process, supporting structures are reduced or eliminated, and powder laying and waste are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing, and specifically relates to a selective laser melting dynamic adaptive supportless printing device. Background Art

[0002] Selective laser melting (SLM) is a main technical approach in the additive manufacturing of metal materials. This technology uses a laser as an energy source and scans layer by layer on a metal powder bed according to the path planned in a three-dimensional CAD slice model. The scanned metal powder is melted and solidified to achieve the effect of metallurgical bonding, and finally a metal part designed by the model is obtained. The SLM technology overcomes the problems brought by traditional technologies in manufacturing metal parts with complex shapes. It can directly form nearly fully dense and mechanically good metal parts.

[0003] However, when printing inclined or overhanging structures, additional support structures are usually required to ensure the printing quality. These support structures not only increase material consumption and manufacturing costs, but also increase the complexity of post-processing. In addition, during the traditional printing process, the same amount of powder is laid for each printed layer, but in fact, not much powder is needed for each printed layer, resulting in a large amount of powder waste. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention proposes a selective laser melting dynamic adaptive supportless printing device, which can dynamically adjust the inclination angle during the printing process, reduce or eliminate the support structure, and reduce the laying and waste of powder.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A selective laser melting dynamic adaptive supportless printing device includes a box body, a scraping mechanism, a powder feeding mechanism, a powder amount control mechanism, an adaptive printing mechanism, and a powder collecting mechanism;

[0007] A first through groove and a second through groove are opened on the box body. A powder feeding mechanism is provided on the first through groove, a forming chamber is provided on the second through groove, a powder amount control mechanism is provided on the top of the forming chamber, an adaptive printing mechanism is provided in the forming chamber, the adaptive printing mechanism is located below the powder amount control mechanism, and a transmission mechanism is provided at the bottom of the adaptive printing mechanism for generating an inclined state of the adaptive printing mechanism; a scraping mechanism is provided on the box body. A blanking hole is opened on the box body on one side of the second through groove, and a powder collecting mechanism is provided below the blanking hole. The scraping plate of the scraping mechanism pushes the powder provided by the powder feeding mechanism above the powder amount control mechanism. The powder amount control mechanism controls the powder usage amount. At the same time, the powder drops to the adaptive printing mechanism, and the scraping plate of the scraping mechanism pushes the remaining powder into the powder collecting mechanism.

[0008] The powder feeding mechanism includes a powder feeding cylinder, a powder carrying plate, and a powder feeding bin. The powder feeding bin is arranged in the first through groove. The powder carrying plate is slidably connected to the inner wall of the powder feeding bin. The output end of the powder feeding cylinder is connected to the powder carrying plate, and the powder feeding cylinder is connected to the air source fixed at the bottom of the forming chamber.

[0009] The adaptive printing mechanism includes a connecting plate, a first lead screw assembly, a second lead screw assembly, and an adaptive inclined forming platform. The connecting plate is connected to the transmission mechanism. There is a mounting seat above the connecting plate. The first lead screw assembly is arranged on the mounting seat. The slider of the first lead screw assembly is connected to the second lead screw assembly, and the slider of the second lead screw assembly is connected to the adaptive inclined forming platform.

[0010] The transmission mechanism includes a transmission cylinder, a Hooke joint, and a connecting joint. The output end of the transmission cylinder is connected to the Hooke joint. The connecting joint is connected to the Hooke joint, and the end of the connecting joint away from the Hooke joint is connected to the connecting plate. The transmission cylinder is connected to the air source fixed at the bottom of the forming chamber.

[0011] There are four transmission cylinders, and the transmission cylinders are symmetrically distributed in pairs at the bottom of the connecting plate; the outer side of the output shaft of the transmission cylinder is wrapped with a telescopic powder shielding cloth.

[0012] The powder amount control mechanism includes a turntable, a blanking plate, a toothed ring, a gear, and a synchronous pulley. A toothed ring is fixedly connected above the turntable. There is a fixing plate on the turntable, and the fixing plate is fixed at the top of the inner wall of the box body. Synchronous pulleys are arranged at both ends of the fixing plate. A conveyor belt is arranged on the synchronous pulleys. A motor I is connected to the synchronous pulley on the side away from the toothed ring. A gear is sleeved on the synchronous pulley on the side close to the toothed ring, and the gear meshes with the toothed ring. A plurality of chutes are opened on the turntable, and a blanking plate is slidably connected in each chute. The opening and closing size of the end of the blanking plate is used to control the powder amount.

[0013] The scraping mechanism includes support blocks. Two support blocks are symmetrically fixed at the top of the box body along the center of the box body. An installation frame is arranged on the support blocks. A first sprocket is rotatably installed in one of the installation frames, and a motor II is arranged at the top thereof. The output end of the motor II is connected to the first sprocket. A second sprocket is rotatably connected in the other installation frame. A chain belt is arranged on the first sprocket and the second sprocket. Slide rails are arranged at the top of the two installation frames, and a slider is slidably arranged on the slide rails. One side outer wall of the slider is connected with a fixed block, and the inner wall of the fixed block is fixedly arranged on the outer wall of the chain belt. A scraper is connected to the outer wall of the fixed block.

[0014] The length of the scraper is equal to the width of the box body, and the bottom end of the scraper is set as an inclined surface, and the inclined surface of the scraper is located on the powder scraping side.

[0015] The inner wall of the fixed block is provided with a groove, and the outer wall of the chain belt is connected to the inner wall of the groove.

[0016] The powder collection mechanism includes a material receiving hopper and a powder collection bin. The material receiving hopper is arranged on the material discharging hole, and the bottom end of the material receiving hopper is communicated with the powder collection bin. The bottom end of the powder collection bin is connected to the bottom end of the inner wall of the box body.

[0017] The present invention has the following beneficial effects compared with the prior art:

[0018] 1. In the present invention, by starting the powder feeding cylinder, the bearing powder feeding plate can be driven to move upward, so as to push the metal powder, which is convenient for the scraping of the scraper. By starting the transmission cylinder, its output end can drive the Hooke hinge and the connecting joint to move. With the cooperation between the Hooke hinge and the connecting joint, the adaptive inclined forming platform can be tilted. In this way, when the overhanging structure of the formed part and the self-supporting printing result cannot be achieved, only by tilting the forming platform can the support requirement be met. Therefore, there is no need to print a support structure or add additional support, thus reducing the manufacturing cost and simplifying the complexity of post-treatment.

[0019] 2. In the present invention, the powder supply is controlled by the powder amount control mechanism. The double lead screw assembly adjusts the movement of the part on the printing platform to the powder leakage point of the powder amount control mechanism, and accurately lays the powder on the part to be printed, reducing the waste of powder in the whole layer laying.

[0020] 3. In the present invention, by starting the motor II to drive the first sprocket to rotate, the chain belt can be driven to rotate through the rotation of the first sprocket. In this way, the fixed block and the slider on its outer wall can be driven to move along with the rotation of the chain belt. At this time, the slider will move horizontally back and forth on the slide rail. The slider and the slide rail can support and stabilize the fixed block and the scraper. At this time, the movement of the fixed block can drive the scraper to move left and right back and forth. In this way, the scraper can scrape the metal powder, which is convenient for subsequent printing. The excess metal powder can be collected by the powder collection bin and the material receiving hopper, preventing the waste of metal powder.

[0021] 4. A retractable dust-proof cloth is also added to the output shaft of the transmission cylinder of the present invention, aiming to prevent the powder from falling on the Hooke hinge and affecting the operation accuracy of the mechanism, avoiding the occurrence of uncontrollable faults, and its retractable property will not interfere with the normal operation of the mechanism. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of a selective laser melting dynamic adaptive supportless printing device;

[0023] Figure 2 It is a schematic diagram of the internal structure of a selective laser melting dynamic adaptive supportless printing device;

[0024] Figure 3 It is a schematic diagram of the connection between the transmission structure and the fixing plate of a selective laser melting dynamic adaptive supportless printing device;

[0025] Figure 4 It is a structural schematic diagram of an adaptive printing mechanism of a selective laser melting dynamic adaptive supportless printing device;

[0026] Figure 5 It is a structural schematic diagram of the connection structure of the first lead screw and the second lead screw of a selective laser melting dynamic adaptive supportless printing device;

[0027] Figure 6 It is a structural schematic diagram of a powder quantity control mechanism of a selective laser melting dynamic adaptive supportless printing device;

[0028] Figure 7 It is a structural schematic diagram of a scraping mechanism of a selective laser melting dynamic adaptive supportless printing device Figure 1 ;

[0029] Figure 8 It is a structural schematic diagram of a powder collection mechanism of a selective laser melting dynamic adaptive supportless printing device Figure 2 ;

[0030] Figure 9 It is a partial structural schematic diagram of a powder collection mechanism of a selective laser melting dynamic adaptive supportless printing device;

[0031] In the figure: 1, box body; 101, first through groove; 102, second through groove; 103, blanking hole; 2, powder feeding mechanism; 201, powder feeding cylinder; 202, powder feeding bearing plate; 203, powder feeding bin; 3, scraping mechanism; 301, support block; 302, mounting frame; 303, first sprocket; 304, motor II; 305, second sprocket; 306, chain belt; 307, slide rail; 308, slider; 309, fixed block; 310, scraper; 4, powder quantity control mechanism; 401, turntable; 4011, chute; 402, toothed ring; 403, synchronous pulley; 404, conveyor belt; 405, gear; 406, blanking plate; 407, fixing plate; 5, adaptive printing mechanism; 501, connecting plate; 502, first lead screw assembly; 5021, first support frame; 5022, first motor; 5023, first lead screw; 503, second lead screw assembly; 5031, second support frame; 5032, second motor; 5033, second lead screw; 504, adaptive inclined forming platform; 505, mounting seat; 6, powder collection mechanism; 601, material receiving hopper; 602, powder collection bin; 7, transmission mechanism; 701, transmission cylinder; 702, Hooke hinge; 703, connecting joint; 704, telescopic powder shielding cloth; 8, forming chamber; 9, gas source. Specific embodiments

[0032] The present invention will be described in detail below with reference to the accompanying drawings.

[0033] As shown Figures 1 to 9 in the figure, a selective laser melting dynamic adaptive supportless printing device includes a box body 1, a scraping mechanism 3, a powder feeding mechanism 2, a powder quantity control mechanism 4, an adaptive printing mechanism 5, and a powder collecting mechanism 6;

[0034] A first through groove 101 and a second through groove 102 are formed in the box body 1. The powder feeding mechanism 2 is arranged on the first through groove 101, and a forming chamber 8 is arranged on the second through groove 102. A powder quantity control mechanism 4 is arranged at the top of the forming chamber 8, and an adaptive printing mechanism 5 is arranged in the forming chamber 8. The adaptive printing mechanism 5 is located below the powder quantity control mechanism 4, and a transmission mechanism 7 is arranged at the bottom of the adaptive printing mechanism 5. The transmission mechanism 7 is used to make the adaptive printing mechanism 5 in an inclined state;

[0035] A scraping mechanism 3 is arranged on the box body 1. A blanking hole 103 is formed in the box body 1 on one side of the second through groove 102, and a powder collecting mechanism 6 is arranged below the blanking hole 103. The scraper 310 of the scraping mechanism 3 pushes the powder provided by the powder feeding mechanism 2 above the powder quantity control mechanism 4. The powder quantity control mechanism 4 controls the powder consumption. At the same time, the powder drops onto the adaptive printing mechanism 5, and the scraper 310 of the scraping mechanism 3 pushes the remaining powder into the powder collecting mechanism 6.

[0036] In this embodiment, the powder provided by the powder feeding mechanism 2 is pushed above the forming chamber 8 through the scraping mechanism 3, and then the powder feeding amount is controlled by the powder quantity control mechanism 4. Then the powder falls above the adaptive printing mechanism 5, and the remaining powder is pushed into the powder collecting mechanism 6 through the scraping mechanism 3 for powder recovery; the transmission mechanism 7 adjusts the inclination angle of the adaptive printing mechanism 5. In this way, only when the overhanging structure of the formed part and the self-supporting printing result cannot be achieved, the forming platform is inclined to meet the support requirements. Therefore, there is no need to print a support structure or add additional support, thereby reducing the manufacturing cost and simplifying the complexity of post-treatment.

[0037] The powder feeding mechanism 2 includes a powder feeding cylinder 201, a powder bearing plate 202, and a powder feeding bin 203. The powder feeding bin 203 is arranged in the first through groove 101. The powder bearing plate 202 is slidably connected to the inner wall of the powder feeding bin 203. The output end of the powder feeding cylinder 201 is connected to the powder bearing plate 202, and the powder feeding cylinder 201 is connected to a gas source 9 fixed at the bottom of the forming chamber 8;

[0038] In this embodiment, the powder feeding cylinder 201 provides power for the powder bearing plate 202, so that the powder bearing plate 202 pushes the powder to slide in the powder feeding bin 203, thereby pushing the powder out of the powder feeding bin 203 to complete the powder supply; the inner wall of the powder feeding bin 203 is in close fit with the outer wall of the powder bearing plate 202, so as to ensure the tight fit between the powder feeding bin 203 and the powder bearing plate 202, thereby preventing metal powder from leaking.

[0039] The adaptive printing mechanism 5 includes a connecting plate 501, a first lead screw assembly 502, a second lead screw assembly 503, and an adaptive tilt forming platform 504. The connecting plate 501 is connected to the transmission mechanism 7. Above the connecting plate 501, there is a mounting seat 505. The first lead screw assembly 502 is provided on the mounting seat 505. The slider of the first lead screw assembly 502 is connected to the second lead screw assembly 503, and the slider of the second lead screw assembly 503 is connected to the adaptive tilt forming platform 504.

[0040] In this embodiment, the first lead screw assembly 502 includes a first support frame 5021, a first motor 5022, and a first lead screw 5023. The first support frame 5021 is fixedly connected to the mounting seat 505. A first motor 5022 is installed on one side of the first support frame 5021. The output end of the first motor 5022 is connected to the first lead screw 5023. The slider of the first lead screw 5023 is provided with the second lead screw assembly 503. The second lead screw assembly 503 includes a second support frame 5031, a second motor 5032, and a second lead screw 5033. The second support frame 5031 is fixedly connected to the slider of the first lead screw 5023. A second motor 5032 is installed on one side of the second support frame 5031. The output end of the second motor 5032 is connected to the second lead screw 5033. The slider of the second lead screw 5033 is connected to the adaptive tilt forming platform 504.

[0041] In this embodiment, when the powder quantity control mechanism 4 conveys powder, the first lead screw assembly 502 and the second lead screw assembly 503 act to adjust the position of the adaptive tilt forming platform 504, so that the powder falls on the adaptive tilt forming platform 504, realizing dynamic printing on the platform.

[0042] The transmission mechanism 7 includes a transmission cylinder 701, a Hooke's joint 702, and a connecting joint 703. The output end of the transmission cylinder 701 is connected to the Hooke's joint 702. The Hooke's joint 702 is connected to the connecting joint 703. One end of the connecting joint 703 away from the Hooke's joint 702 is connected to the connecting plate 501. The transmission cylinder 701 is connected to a gas source 9 fixed at the bottom of the forming chamber 8.

[0043] There are four transmission cylinders 701. The transmission cylinders 701 are symmetrically distributed in pairs at the bottom of the connecting plate 501. A telescopic powder shielding cloth 704 is wrapped around the outer side of the output shaft of the transmission cylinder 701.

[0044] In this embodiment, any one of the four transmission cylinders 701 can be started arbitrarily. By using the output end to drive the Hooke's joint 702 and the connecting joint 703 to cooperate, the adaptive tilt forming platform 504 can be in an inclined state at any angle. The telescopic powder shielding cloth 704 outside the transmission cylinder 701 is used to prevent the falling powder from affecting the operation of the Hooke's joint 702 and the connecting joint 703.

[0045] The powder quantity control mechanism 4 includes a turntable 401, a blanking plate 406, a toothed ring 402, a gear 405, and a synchronous pulley 403. A toothed ring 402 is fixedly connected above the turntable 401. A fixing plate 407 is provided on the turntable 401. The fixing plate 407 is fixed at the top end of the inner wall of the box body 1. Synchronous pulleys 403 are provided at both ends of the fixing plate 407. A conveyor belt 404 is provided on the synchronous pulleys 403. A motor I is connected to the synchronous pulley 403 on the side away from the toothed ring 402. A gear 405 is sleeved on the synchronous pulley 403 on the side close to the toothed ring 402. The gear 405 meshes with the toothed ring 402. A plurality of sliding grooves 4011 are formed on the turntable 401. A blanking plate 406 is slidably connected in each sliding groove 4011. The opening and closing size of the end of the blanking plate 406 is used for controlling the powder quantity.

[0046] In this embodiment, the motor I drives one of the synchronous pulleys 403 to rotate. Through the transmission of the conveyor belt 404, the synchronous pulley 403 sleeved with the gear 405 rotates, causing the gear 405 to rotate. Through the meshing of the gear 405 and the toothed ring 402, the gear 405 and the turntable 401 below it are driven to rotate together. As the turntable 401 rotates, a plurality of blanking plates 406 slide on the sliding grooves 4011 of the turntable 401, thereby realizing the opening and closing of the ends of the blanking plates 406. Through this setting, when there are more printing parts, the opening of the blanking plate 406 can be made larger, and vice versa, so as to avoid excessive waste of dust.

[0047] The scraping mechanism 3 includes support blocks 301. Two support blocks 301 are symmetrically fixed on the top of the box body 1 along the center of the box body 1. An installation frame 302 is provided on the support block 301. A first sprocket 303 is rotatably installed in one of the installation frames 302, and a motor II 304 is provided at its top. The output end of the motor II 304 is connected to the first sprocket 303. A second sprocket 305 is rotatably connected in the other installation frame 302. A chain belt 306 is provided on the first sprocket 303 and the second sprocket 305. Slide rails 307 are provided on the tops of the two installation frames 302. A slider 308 is slidably arranged on the slide rails 307. A fixing block 309 is connected to the outer wall of one side of the slider 308. The inner wall of the fixing block 309 is fixedly arranged on the outer wall of the chain belt 306. A groove is formed in the inner wall of the fixing block 309. The outer wall of the chain belt 306 is connected to the inner wall of the groove. A scraper 310 is connected to the outer wall of the fixing block 309.

[0048] The length of the scraper 310 is equal to the width of the box body 1. The bottom end of the scraper 310 is provided as an inclined surface. The inclined surface of the scraper 310 is located on the powder scraping side, so that it is easier to centrally scrape and move the metal powder.

[0049] In this embodiment, the rotation mode of the motor II 304 is reciprocating left and right rotation. In this way, the motor II 304 can drive the chain belt 306 to move reciprocating left and right, so as to drive the scraper 310 to move reciprocating left and right, thus facilitating the scraping operation of the metal powder.

[0050] In this embodiment, the motor II 304 drives the first sprocket 303 to move. Furthermore, the chain belt 306 moves on the first sprocket 303 and the second sprocket 305. The fixing block 309 is fixed on the slider 308. The inner wall of the fixing block 309 is fixedly arranged on the outer wall of the chain belt 306. The movement of the chain belt 306 drives the scraper 310 connected to the fixing block 309 to move, so as to convey the powder material. The slider 308 and the slide rail 307 play a guiding role.

[0051] The powder collecting mechanism 6 includes a material receiving hopper 601 and a powder collecting bin 602. The material receiving hopper 601 is arranged on the blanking hole 103. The bottom end of the material receiving hopper 601 is communicated with the powder collecting bin 602. The bottom end of the powder collecting bin 602 is connected to the bottom end of the inner wall of the box body 1.

[0052] The implementation principle of a selective laser melting dynamic adaptive supportless printing device in this embodiment is as follows: First, the metal powder is put into the powder feeding bin 203. Subsequently, the powder feeding cylinder 201 is started, and its output end will drive the powder loading plate 202 to move upward. In this way, the powder loading plate 202 will drive the metal powder to move upward. Then, the powder material in the powder feeding bin 203 is pushed upward by the powder loading plate 202 by a layer thickness. First, the first layer of the printed part is started. The scraper 310 in the scraping mechanism 3 is started to scrape the powder to the powder quantity control mechanism 4. The powder quantity control mechanism 4 opens and closes. By starting the motor I, the synchronous pulley 403 is driven to rotate. In this way, the conveyor belt 404 can be driven to rotate, so as to drive the gear 405 to rotate. By the rotation of the gear 405, the toothed ring 402 and the turntable 401 can be driven to rotate. By the rotation of the turntable 401, the blanking plate 406 can be pushed to open and close, so as to control the blanking quantity, thus avoiding the waste of powder during the printing process;

[0053] Before the powder falls onto the adaptive tilt forming platform 504, the four drive cylinders 701 need to be synchronously activated. Their output ends will drive the adaptive tilt forming platform 504 to move upward until it is flush with the top surface of the box body 1. After scraping the metal powder onto the adaptive tilt forming platform 504, the first layer can be printed. At the same time, according to the required tilt of the print, any of the four drive cylinders 701 can be activated. By using the output end to drive the Hooke's joint 702 and the connecting section 703 to cooperate, the adaptive tilt forming platform 504 can be tilted at any angle. Thus, when it is necessary to form the cross-section of the part, when the overhanging structure of the formed part and the self-supporting printing result cannot be achieved, the forming platform can be tilted to meet the support requirements, so there is no need to print a support structure or add additional support. At the same time, start the first motor 5022 to drive the first lead screw 5023 to rotate, thereby driving the second support frame 5031 to move back and forth. By starting the second motor 5032 to drive the second lead screw 5033 to rotate, the adaptive tilt forming platform 504 can be driven to move left and right. In this way, the adaptive tilt forming platform 504 can be driven to move to a specific position for dynamic printing through the front-back and left-right movements. When printing the next layer, the adaptive tilt forming platform 504 needs to meet the tilt requirements of the next layer of printing, leak the powder into the forming chamber 8, collect the metal powder that slides down due to the tilt of the adaptive tilt forming platform 504 and reuse it.

[0054] When the scraping mechanism is in use, after the powder-carrying plate 202 pushes the metal powder upward to the top surface of the box body 1, the motor II 304 can be activated. Its output end will drive the first sprocket 303 to rotate. By the rotation of the first sprocket 303, the chain belt 306 can be driven to rotate. At the same time, the second sprocket 305 on the other side will rotate, which can support the rotation of the chain belt 306 to ensure the rotation of the chain belt 306. At the same time, during the rotation of the chain belt 306, its outer wall will drive the fixed block 309 and the slider 308 to move. In this way, the slider 308 can move back and forth left and right on the slide rail 307. Through the cooperation between the slider 308 and the slide rail 307, a supporting effect can be formed on the fixed block 309 and the scraper 310 to ensure the stability during the movement. In this way, the fixed block 309 can drive the scraper 310 to move back and forth left and right, thereby scraping the metal powder. The excess metal powder will be scraped into the material discharge hole 103 and then enter the powder collection bin 602 through the material receiving hopper 601. In this way, the excess metal powder can be collected to prevent waste of metal powder.

[0055] The present invention can dynamically adjust the tilt angle during the printing process, reduce or eliminate the need for a support structure, and provides a double lead screw assembly to control the horizontal degree of freedom movement of the printing platform. At the same time, it cooperates with the powder amount control mechanism to lay the powder required for printing the part to be printed, reducing the laying and waste of powder.

Claims

1. A selective laser melting dynamic adaptive support-free printing device, characterized in that: It includes a box body, a scraping mechanism, a powder feeding mechanism, a powder quantity control mechanism, an adaptive printing mechanism, and a powder collecting mechanism; The box body is provided with a first through slot and a second through slot, the first through slot is provided with a powder feeding mechanism, the second through slot is provided with a molding chamber, the top of the molding chamber is provided with a powder quantity control mechanism, the molding chamber is provided with an adaptive printing mechanism, the adaptive printing mechanism is located below the powder quantity control mechanism, the bottom of the adaptive printing mechanism is provided with a transmission mechanism, the transmission mechanism is used for the adaptive printing mechanism to produce an inclined state; the box body is provided with a scraping mechanism, the box body located on one side of the second through slot is provided with a feeding hole, a powder collecting mechanism is provided below the feeding hole, the scraper of the scraping mechanism pushes the powder provided by the powder feeding mechanism to the top of the powder quantity control mechanism, the powder quantity control mechanism controls the amount of powder, and at the same time, the powder falls to the adaptive printing mechanism, and the scraper of the scraping mechanism pushes the remaining powder into the powder collecting mechanism.

2. The selective laser melting dynamic adaptive support-free printing device according to claim 1, characterized in that: The powder feeding mechanism includes a powder feeding cylinder, a powder feeding plate, and a powder feeding bin. The powder feeding bin is arranged in the first through groove. The powder feeding plate is slidably connected to the inner wall of the powder feeding bin. The output end of the powder feeding cylinder is connected to the powder feeding plate. The powder feeding cylinder is connected to an air source fixed at the bottom of the molding chamber.

3. The selective laser melting dynamic adaptive support-free printing device according to claim 1, characterized in that: The adaptive printing mechanism includes a connecting plate, a first screw assembly, a second screw assembly, and an adaptive tilting forming platform. The connecting plate is connected to the transmission mechanism. A mounting seat is provided above the connecting plate. The mounting seat is provided with a first screw assembly. The slider of the first screw assembly is connected to the second screw assembly. The slider of the second screw assembly is connected to the adaptive tilting forming platform.

4. The selective laser melting dynamic adaptive support-free printing device according to claim 3, characterized in that: The transmission mechanism includes a transmission cylinder, a Hooke's hinge, and a connecting joint. The output end of the transmission cylinder is connected to the Hooke's hinge, the Hooke's hinge is connected to the connecting joint, the end of the connecting joint away from the Hooke's hinge is connected to a connecting plate, and the transmission cylinder is connected to an air source fixed at the bottom of the molding chamber.

5. The selective laser melting dynamic adaptive support-free printing device according to claim 4, characterized in that: There are four transmission cylinders, which are arranged in pairs and symmetrically distributed at the bottom of the connecting plate; the outer sides of the output shafts of the transmission cylinders are wrapped with retractable powder-covering cloths.

6. The selective laser melting dynamic adaptive support-free printing device according to claim 1, characterized in that: The powder amount control mechanism includes a turntable, a feeding plate, a gear ring, a gear, and a synchronous wheel. A gear ring is fixedly connected above the turntable, and a fixed plate is provided on the turntable. The fixed plate is fixed to the top of the inner wall of the box body. Synchronous wheels are provided at both ends of the fixed plate, and a conveyor belt is provided on the synchronous wheel. The synchronous wheel away from the gear ring is connected to the motor I, and the synchronous wheel close to the gear ring is provided with a gear. The gear is meshed with the gear ring. A plurality of slide grooves are opened on the turntable, and a feeding plate is slidably connected in each slide groove. The opening and closing size of the end of the feeding plate is used to control the powder amount.

7. The selective laser melting dynamic adaptive support-free printing device according to claim 1, characterized in that: The scraping mechanism includes support blocks, two support blocks are symmetrically fixed on the top of the box along the center of the box, a mounting frame is provided on the support block, a first sprocket is rotatably installed in one of the mounting frames, and a motor II is provided on the top of the mounting frame, and the first sprocket is connected to the output end of the motor II, and a second sprocket is rotatably connected in the other mounting frame, the first sprocket and the second sprocket are provided with chain belts, slide rails are provided on the top of the two mounting frames, a slider is slidably provided on the slide rails, a fixed block is connected to the outer wall of one side of the slider, the inner wall of the fixed block is fixedly arranged on the outer wall of the chain belt, and a scraper is connected to the outer wall of the fixed block.

8. The selective laser melting dynamic adaptive support-free printing device according to claim 7, characterized in that: The length of the scraper is equal to the width of the box body, the bottom end of the scraper is arranged as an inclined surface, and the inclined surface of the scraper is located at the powder scraping side.

9. The selective laser melting dynamic adaptive support-free printing device according to claim 7, characterized in that: The inner wall of the fixing block is provided with a groove, and the outer wall of the chain belt is connected to the inner wall of the groove.

10. The selective laser melting dynamic adaptive support-free printing device according to claim 1, characterized in that: The powder collecting mechanism comprises a collecting hopper and a powder collecting bin. The collecting hopper is arranged on the feeding hole. The bottom end of the collecting hopper is connected with the powder collecting bin. The bottom end of the powder collecting bin is connected to the bottom end of the inner wall of the box body.

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