Additive manufacturing molding equipment

Abstract

The present invention belongs to the field of additive manufacturing technology, and specifically is an additive manufacturing molding equipment, 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 smoothing assembly is slidably installed; by setting the stirring assembly, the powder coming out of the storage cavity on the discharging station is dispersed, even if the position where the storage cavity of the discharging station and the storage cavity of the feeding station are connected is blocked, the powder can still be evenly dispersed in the storage cavity after entering the storage cavity 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.

Description

Technical Field

[0001] The invention belongs to the field of additive manufacturing, and in particular to an additive manufacturing device. Background Art

[0002] Additive manufacturing equipment uses the discrete-accumulation principle to form physical objects by layer-by-layer accumulation. This process is also called 3D printing, which can be applied to the processing of metal materials such as titanium alloys, aluminum alloys and steel, and non-metallic materials such as plastics and ceramics.

[0003] For metal materials, powder bed laser sintering can be used for processing. The processing process is as follows: the three-dimensional model of the real object is imported into the computer, the computer divides the model into several layers, and the metal powder is spread flat in the molding cylinder of the molding unit through the powder spreading unit. Then the laser unit is controlled to emit a laser beam to scan the cross-section of the model plane layer on the powder. The powder is irradiated by the laser beam, melts and solidifies quickly, and then the molding cylinder is controlled to move downward, and the powder spreading unit is controlled to spread the powder again, and so on. Each plane layer of the model is printed from bottom to top to produce a complete real object.

[0004] The powder spreading unit includes a powder box for storing powder and a scraper for spreading the powder. Before spreading the powder, it is necessary to wait for the powder to be discharged from the discharge port of the powder box. In order to prevent the powder from blocking the discharge port during the feeding process, a vibration device is usually used to vibrate the powder box. However, vibration requires a process. During this process, the blocked place cannot be discharged, and the powder is discharged from other positions. As a result, after the discharge is completed, the powder is unevenly distributed along the direction of the discharge port, causing the scraper to spread the powder unevenly during the spreading process.

[0005] To this end, the present invention provides an additive manufacturing molding device. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: an additive manufacturing molding device described in the present invention includes a machine body, a powder spreading unit, a laser unit and a molding unit, the molding unit includes a molding cylinder slidably installed inside the machine body, and the powder spreading unit includes: a powder box fixedly installed inside the machine body, the interior of the powder box includes a No. 1 cavity and a No. 2 cavity, and the bottom end of the powder box is provided with a discharge port; a discharge assembly installed in the No. 2 cavity, the discharge assembly includes a No. 1 rotating shaft rotatably installed in the No. 2 cavity and a plurality of telescopic plates fixedly installed on the No. 1 rotating shaft, the telescopic plates divide the No. 2 cavity into a plurality of storage cavities; A stirring component installed in the second cavity, the stirring component is installed near the discharge port, the stirring component is used to stir the powder flowing out from the adjacent storage cavity, and evenly fill the powder in the storage cavity containing the stirring component, and the powder is discharged from the discharge port under the action of gravity; a receiving plate installed in the machine body, the powder discharged from the discharge port falls onto the receiving plate; a powder spreading platform fixedly installed in the machine body, the powder spreading platform is installed in cooperation with the forming cylinder; a side plate fixedly installed inside the machine body, a smoothing component is slidably installed on the side plate, and the smoothing component is used to evenly spread the powder in the receiving plate on the forming cylinder.

[0008] Preferably, the unloading assembly also includes: a disc for driving the No. 1 rotating shaft to rotate, the disc is rotatably connected to the machine body, and the movable end of the telescopic plate is slidably connected to the disc; a slide groove is provided on the machine body, and the movable end of the telescopic plate is slidably connected to the slide groove.

[0009] Preferably, the material discharge component also includes: a plurality of air vents provided on the No. 1 rotating shaft, the air vents being located between two adjacent telescopic plates; a No. 1 air pipe fixedly installed in the powder box, the No. 1 air pipe being rotatably connected to the No. 1 rotating shaft, the No. 1 air pipe being connected to a material storage cavity adjacent to the stirring component through the air vents, air is introduced into the material storage cavity through the No. 1 air pipe to accelerate the discharge of powder in the material storage cavity into the material storage cavity containing the stirring component; a plurality of filter holes provided at the movable end of the telescopic plate; a plate slidably installed at the movable end of the telescopic plate, the sliding of the plate being used to control whether the filter holes are exposed or not; an exhaust pipe fixedly installed on the powder box, the exhaust pipe being connected to another material storage cavity containing the stirring component, the gas in the material storage cavity containing the stirring component is discharged from the exhaust pipe through the filter holes, and the powder is discharged from the material discharge port.

[0010] Preferably, the stirring assembly includes: a No. 2 rotating shaft rotatably installed in the machine body; a slide plate installed on the No. 2 rotating shaft plate, the slide plate is slidably connected to the No. 2 rotating shaft, and a No. 1 spring is installed between the slide plate and the No. 2 rotating shaft; a No. 2 air pipe installed on the powder box, gas enters the No. 2 cavity from the No. 2 air pipe, and can blow the slide plate and the No. 2 rotating shaft to rotate.

[0011] Preferably, the stirring assembly also includes an arc plate fixedly installed in the second cavity, and the telescopic plate fits against the wall surface of the arc plate during rotation. The arc plate cooperates with the slide plate to prevent the powder from being discharged directly from the discharge port along the inner wall of the second cavity.

[0012] Preferably, the device also includes an arc panel rotatably installed on the powder box, the arc panel is used to push the sticking plate to slide, the side wall of the arc panel is in contact with the side wall of the No. 2 rotating shaft, the rotation of the No. 2 rotating shaft can push the arc panel to rotate, a No. 2 spring is installed between the arc panel and the powder box, and a No. 3 spring is installed between the sticking plate and the telescopic plate.

[0013] Preferably, when the telescopic plate is contracted, the distance between the telescopic plate and the inner wall of the second cavity is smaller than the width of the discharge port.

[0014] Preferably, the smoothing assembly comprises a scraper for spreading powder and an inclined plate for guiding flow, and the inclined plate is rotatably connected to the scraper.

[0015] Preferably, the equipment also includes a collecting box fixedly mounted on one end of the receiving plate away from the powder spreading platform, and the receiving plate is rotatably connected to the side plate. The receiving plate rotates to pour the remaining powder on the receiving plate into the collecting box, and the collecting box is connected to a connecting pipe, which is connected to the No. 1 gas pipe.

[0016] Preferably, the device further comprises a round block rotatably mounted on the side plate, wherein the round block is used to drive the receiving plate to rotate, and the scraper can drive the round block to rotate by friction during the sliding process.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The additive manufacturing forming equipment described in the present invention, by setting a feeding component, evenly divides the No. 2 cavity into several storage chambers, so that the volume of powder contained in each storage chamber is the same, and quantitative feeding can be achieved. In conjunction with the stirring component, the powder coming out of the storage chamber on the discharge station is dispersed. Even if part of the connection between the storage chamber of the discharge station and the storage chamber of the feeding station is blocked, the powder can still be evenly dispersed in the storage chamber after entering the storage chamber of the feeding station. Therefore, 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, ensuring the uniformity of the powder after the leveling component has leveled the powder.

[0019] 2. The additive manufacturing forming equipment described in the present invention can not only accelerate the discharge speed of powder from the discharge station by setting a No. 1 air pipe, but also blow away all the powder in the discharge station, so as to avoid the problem that the powder cannot be completely discharged when relying solely on gravity, resulting in different volumes of powder discharged each time the material is discharged, thus affecting the powder spreading effect.

[0020] 3. The additive manufacturing forming equipment described in the present invention is equipped with a rotating receiving plate. After the scraper moves to the powder spreading platform, the collecting box is controlled to open and the receiving plate is controlled to rotate so that the remaining powder on the receiving plate can enter the collecting box. When unloading the material next time, the remaining powder can be blown from the connecting pipe into the No. 1 air pipe by blowing air into the collecting box, and then enter the storage chamber of the discharge station from the No. 1 air pipe for recycling, thereby avoiding the problem that the quality of the same batch of powders will be deteriorated after being accumulated on the receiving plate for a long time and needs to be processed when it is recycled again. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the powder spreading platform and the powder box of the present invention;

[0024] Figure 3 It is a side sectional view of the powder spreading platform and the powder box of the present invention;

[0025] Figure 4 is a side sectional view of the powder box of the present invention;

[0026] Figure 5 is a side sectional view of the powder box of the present invention;

[0027] Figure 6 It is a schematic diagram of the internal structure of the powder box of the present invention;

[0028] Figure 7It is a structural schematic diagram of the material storage chamber of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the No. 1 gas transmission pipeline of the present invention;

[0030] Fig. 9 is a cross-sectional view of the slide plate and the second rotating shaft of the present invention;

[0031] Fig.10 It is an exploded view of the scraper and the inclined plate of the present invention;

[0032] Fig.11 It is a structural schematic diagram of the material receiving plate of the present invention;

[0033] Fig.12 It is a structural schematic diagram of the pasting board of the present invention;

[0034] In the figure: 1, machine body; 2, powder spreading unit; 21, powder box; 22, cavity No. 1; 23, cavity No. 2; 24, discharge port; 25, discharge assembly; 251, shaft No. 1; 252, telescopic plate; 254, disc; 256, chute; 257, vent; 258, gas pipe No. 1; 259, filter hole; 2510, plate; 2511, exhaust pipe; 26, storage chamber; 27, stirring assembly; 271, No. 2 rotating shaft; 272, slide plate; 273, No. 2 air pipe; 274, arc plate; 275, No. 1 spring; 28, receiving plate; 29, powder spreading platform; 210, side plate; 211, leveling assembly; 2111, scraper; 2112, inclined plate; 3, laser unit; 4, molding unit; 41, molding cylinder; 5, arc plate; 6, No. 2 spring; 7, No. 3 spring; 8, collecting box; 9, connecting pipe; 10, round block. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0036] like Figure 1-Figure 12As shown, an additive manufacturing molding device described in an embodiment of the present invention includes a body 1, a powder spreading unit 2, a laser unit 3 and a molding unit 4, wherein the molding unit 4 includes a molding cylinder 41 slidably mounted inside the body 1, and the powder spreading unit 2 includes: a powder box 21 fixedly mounted inside the body 1, the interior of the powder box 21 includes a first cavity 22 and a second cavity 23, and a discharge port 24 is provided at the bottom end of the powder box 21; a discharge assembly 25 installed in the second cavity 23, the discharge assembly 25 includes a first rotating shaft 251 rotatably mounted in the second cavity 23 and a plurality of telescopic plates 252 fixedly mounted on the first rotating shaft 251, the telescopic plates 252 divide the second cavity 23 into a plurality of storage cavities 26; a discharge assembly 25 installed in the second cavity 2 3, the stirring component 27 is installed near the discharge port 24, the stirring component 27 is used to stir the powder flowing out from the adjacent storage chamber 26, and the powder is evenly filled in the storage chamber 26 containing the stirring component 27, and the powder is discharged from the discharge port 24 under the action of gravity; a receiving plate 28 is installed in the body 1, and the powder discharged from the discharge port 24 falls onto the receiving plate 28; a powder spreading platform 29 is fixedly installed in the body 1, and the powder spreading platform 29 is installed in cooperation with the forming cylinder 41; a side plate 210 is fixedly installed inside the body 1, and a smoothing component 211 is slidably installed on the side plate 210, and the smoothing component 211 is used to evenly spread the powder in the receiving plate 28 on the forming cylinder 41.

[0037] Specifically, the powder spreading unit 2 includes a powder box for storing powder and a scraper 2111 for spreading powder. Before spreading powder, it is necessary to wait for the powder to be discharged from the discharge port of the powder box. In order to prevent the powder from blocking the discharge port during the discharge process, a vibration device is usually used to vibrate the powder box. However, the vibration requires a process. During this process, the blocked part cannot be discharged, and the powder is discharged from other positions, resulting in uneven distribution of powder along the direction of the discharge port after the discharge is completed, so that the scraper 2111 spreads the powder unevenly during the spreading process.

[0038] by Figure 7In the embodiment, the position of the storage chamber 26 on the right side of the discharge port 24 is the discharge station, the position of the storage chamber 26 connected to the discharge port 24 is the discharge station, and the position of the storage chamber 26 connected to the first cavity 22 is the loading station. Before working, the physical model to be manufactured is imported into the computer, and the computer decomposes the three-dimensional model into several plane layers. During working, the discharge assembly 25 is controlled to rotate. When the storage chamber 26 moves to the loading station, the storage chamber 26 is connected to the first cavity 22. , so the powder in the No. 1 cavity 22 falls into the storage cavity 26, and the unloading assembly 25 continues to rotate until the storage cavity 26 leaves the loading station and is no longer connected to the No. 1 cavity 22. At this time, the discharge cavity is filled with powder, and the unloading assembly 25 continues to rotate until the storage cavity 26 is located at the discharge station. The unloading assembly 25 is controlled to stop rotating, and at the same time, the telescopic plate 252 near the unloading station is controlled to shrink in the direction away from the inner wall of the No. 2 cavity 23, so that the two storage cavities 26 of the discharge station and the unloading station are connected. At this time, the powder in the discharge station falls into the cavity of the unloading station under the action of gravity, and the stirring component 27 is controlled to work, so that after the powder falls into the unloading station, it is dispersed in the storage cavity 26 of the entire unloading station by the stirring component 27, and then the powder falls from the unloading port 24 to the receiving plate 28 under the action of gravity, until all the powder in the storage cavity 26 of the discharge station falls onto the receiving plate 28, and then the smoothing component 211 is controlled to slide horizontally to spread the powder on the receiving plate 28 on the forming cylinder 41 At the same time, the unloading assembly 25 is controlled to rotate so that the storage chamber 26 rotates to the unloading station, and the telescopic plate 252 is controlled to extend until it fits with the inner wall of the second cavity 23. Then, the laser unit 3 is controlled to emit a laser beam to scan the cross section of the model plane layer on the powder. The powder is irradiated by the laser beam, melts and solidifies quickly, and then the forming cylinder 41 is controlled to move downward, and the powder spreading unit 2 is controlled to spread the powder again. By analogy, each plane layer of the model is printed from bottom to top, and a complete physical object can be produced.

[0039] By setting up the unloading component 25, the No. 2 cavity 23 is evenly divided into several storage chambers 26, so the volume of powder contained in each storage chamber 26 is the same, and quantitative unloading can be achieved. In conjunction with the stirring component 27, the powder coming out of the storage chamber 26 on the discharge station is dispersed. Even if part of the connection between the storage chamber 26 of the discharge station and the storage chamber 26 of the unloading station is blocked, the powder can still be evenly dispersed in the storage chamber 26 after entering the storage chamber 26 of the unloading station. Therefore, after the powder falls onto the receiving plate 28 under the action of gravity, it can be evenly distributed on the receiving plate 28 along the direction of the discharge port, ensuring the uniformity of the powder after the leveling component 211 has leveled the powder.

[0040] like Figure 4-Figure 8As shown, the unloading assembly 25 also includes: a disc 254 for driving the No. 1 rotating shaft 251 to rotate, the disc 254 is rotatably connected to the body 1, and the movable end of the telescopic plate 252 is slidably connected to the disc 254; a slide groove 256 is opened on the body 1, and the movable end of the telescopic plate 252 is slidably connected to the slide groove 256.

[0041] Specifically, during operation, the control disk 254 is rotated to drive the telescopic plate 252 to rotate synchronously. During the rotation, the movable end of the telescopic plate 252 slides with the slide groove 256. Therefore, during the rotation of the storage chamber 26 to the discharge station, the telescopic plate 252 close to the discharge port side slides radially in the direction close to the axis of the circular plate, so that the telescopic plate 252 shrinks. Therefore, the powder can flow into the storage chamber 26 of the discharge station through the contracted contraction plate. After the discharge is completed, the control disk 254 is rotated to drive the telescopic plate 252 to be selected synchronously. After passing through the stirring assembly 27, the telescopic plate 252 in the contracted state moves radially in the direction away from the axis of the circular plate until the telescopic plate 252 is extended again. The right telescopic plate 252 adjacent to the telescopic plate 252 shrinks during the rotation process. There is no need to set up an additional device to drive the telescopic plate 252 to retract, which is easy to use.

[0042] like Figure 4-Figure 8 As shown, the unloading assembly 25 also includes: a plurality of vent holes 257 provided on the No. 1 rotating shaft 251, the vent holes 257 being located between two adjacent telescopic plates 252; a No. 1 air pipe 258 fixedly installed in the powder box 21, the No. 1 air pipe 258 being rotatably connected to the No. 1 rotating shaft 251, the No. 1 air pipe 258 being connected to a storage chamber 26 adjacent to the stirring assembly 27 through the vent holes 257, and air being introduced into the storage chamber 26 through the No. 1 air pipe 258, so as to accelerate the discharge of the powder in the storage chamber 26 to the powder containing the Inside the storage cavity 26 of the stirring component 27; a plurality of filter holes 259 opened at the movable end of the telescopic plate 252; a plate 2510 slidably mounted on the movable end of the telescopic plate 252, the sliding of the plate 2510 is used to control whether the filter holes 259 are exposed; an exhaust pipe 2511 fixedly mounted on the powder box 21, the exhaust pipe 2511 is connected to another storage cavity 26 containing the stirring component 27, the gas in the storage cavity 26 containing the stirring component 27 is discharged from the exhaust pipe 2511 through the filter holes 259, and the powder is discharged from the discharge port 24.

[0043] Specifically, during operation, when the storage chamber 26 rotates to the discharge station, the vent hole 257 on the storage chamber 26 is connected to the No. 1 air pipe 258, and the gas enters the storage chamber 26 from the vent hole 257, blowing the powder from the storage chamber 26 of the discharge station to the storage chamber 26 of the unloading station. At the same time, the sticking plate 2510 on the telescopic plate 252 on the left side of the storage chamber 26 of the unloading station is controlled to slide, so that the filter hole 259 leaks out, so that the exhaust pipe 2511 is connected to the No. 2 cavity 23. When unloading, the air discharged from the No. 1 air pipe 258 blows the powder from the discharge station into the unloading station, and the stirring component 27 The stirring causes the powder to be dispersed in the storage chamber 26 of the unloading station, and the stirring component 27 drives the gas to rotate. During the rotation, the gas contacts the telescopic plate 252 and is discharged from the unloading station through the filter hole 259 and discharged into the exhaust pipe 2511. The filter hole 259 retains the powder in the storage chamber 26 of the unloading station. By setting a No. 1 air supply pipe 258, not only the discharge speed of the powder from the discharging station can be accelerated, but also the powder in the discharging station can be blown away, so as to avoid the problem that the powder cannot be completely discharged when relying solely on gravity, resulting in different volumes of powder discharged each time the material is unloaded, affecting the powder spreading effect.

[0044] like Figure 4-Figure 9 As shown, the stirring assembly 27 includes: a No. 2 rotating shaft 271 rotatably installed in the body 1; a slide plate 272 installed on the No. 2 rotating shaft 271, the slide plate 272 is slidably connected with the No. 2 rotating shaft 271, and a No. 1 spring 275 is installed between the slide plate 272 and the No. 2 rotating shaft 271; a No. 2 air pipe 273 installed on the powder box 21, and the gas enters the No. 2 cavity 23 from the No. 2 air pipe 273, which can blow the slide plate 272 and the No. 2 rotating shaft 271 to rotate.

[0045] Specifically, air is ventilated to the storage chamber 26 located at the unloading station through the No. 2 air pipe 273, and the powder that falls into the storage chamber 26 at the unloading station can be blown to flow to the slide plate 272. At the same time, the gas can blow the No. 2 circular shaft and the slide plate 272 to rotate. During the rotation, the slide plate 272 interacts in a direction away from the center line of the No. 2 rotating shaft 271 under the action of centrifugal force. At this time, the No. 1 spring 275 stretches. After the work is completed, the blowing of gas is stopped, and the slide plate 272 returns to its original state under the action of the pressure of the No. 1 spring 275; by setting the No. 2 air pipe 273, the No. 2 rotating shaft 271 can be blown to rotate to disperse and stir the powder, and with the relatively slidable slide plate 272, the stirring assembly 27 expands during rotation, which has a better dispersion and stirring effect on the powder. At the same time, when the blowing stops, it returns to its original state to facilitate the telescopic plate 252 to pass through the stirring assembly 27.

[0046] like Figure 4-Figure 8As shown, the stirring assembly 27 also includes an arc plate 274 fixedly installed in the second cavity 23. During the rotation of the telescopic plate 252, it fits with the wall surface of the arc plate 274. The arc plate 274 cooperates with the slide plate 272 to prevent the powder from being discharged directly from the discharge port along the inner wall of the second cavity 23.

[0047] Specifically, the arc plate 274 is provided to block the powder, thereby preventing the powder from directly flowing out of the discharge port and causing the problem of uneven powder.

[0048] like Figure 4-Figure 8 As shown, the device also includes an arc panel 5 rotatably installed on the powder box 21, and the arc panel 5 is used to push the sticking plate 2510 to slide. The side wall of the arc panel 5 is in contact with the side wall of the second rotating shaft 271. The rotation of the second rotating shaft 271 can push the arc panel 5 to rotate. A second spring 6 is installed between the arc panel 5 and the powder box 21, and a third spring 7 is installed between the sticking plate 2510 and the telescopic plate 252.

[0049] Specifically, when the No. 2 rotating shaft 271 rotates, the No. 2 rotating shaft 271 drives the arc panel 5 to rotate clockwise through friction. During the rotation of the arc panel 5, the patch plate 2510 can be pushed to move in the direction close to the axis of the No. 1 rotating shaft 251, so that the patch plate 2510 moves at the movable end of the telescopic rod to leak out the filter hole 259 on the telescopic plate 252. At this time, the No. 2 spring 6 and the No. 3 spring 7 are stretched, and the gas enters the storage cavity 26 on the right side of the unloading station from the filter hole 259 and is discharged from the cavity through the exhaust pipe 2511. After the No. 2 circular shaft stops rotating, the arc panel 5 returns to its original position under the action of the elastic force of the No. 2 spring 6, and the patch plate 2510 slides under the action of the elastic force of the No. 3 spring 7 until the filter hole 259 is blocked. There is no need to set up an additional device to drive the patch plate 2510 to slide, which is easy to use.

[0050] like Figure 7 As shown, when the telescopic plate 252 contracts, the distance between the telescopic plate 252 and the inner wall of the second cavity 23 is smaller than the width of the discharge port.

[0051] Specifically, when the telescopic plate 252 contracts, the width of the flow opening for the powder from the discharging station to the unloading station is smaller than the width of the discharge port, thereby avoiding the problem of blockage at the discharge port when the powder falls from the discharge port.

[0052] like Figure 3 and Fig.10 As shown, the smoothing assembly 211 includes a scraper 2111 for spreading powder and an inclined plate 2112 for guiding flow, and the inclined plate 2112 is rotatably connected to the scraper 2111.

[0053] Specifically, an electric telescopic rod can be installed between the scraper 2111 and the inclined plate 2112. During the powder unloading process, the inclined plate 2112 is located below the discharge port, and the powder slides along the inclined edge of the inclined plate 2112 to the receiving plate 28. While the inclined plate 2112 guides the flow, the electric telescopic rod is controlled to extend so that the inclined plate 2112 rotates, that is, the location where the powder falls changes, so that the powder can be evenly accumulated near the discharge port of the receiving plate 28.

[0054] like Figure 2 and Figure 3 As shown, the equipment also includes a collecting box 8 fixedly mounted on the end of the receiving plate 28 away from the powder spreading platform 29. The receiving plate 28 is rotatably connected to the side plate 210. The receiving plate 28 rotates to pour the remaining powder on the receiving plate 28 into the collecting box 8. The collecting box is connected to a connecting pipe 9, and the connecting pipe 9 is connected to the No. 1 gas pipe 258.

[0055] Specifically, since there is a certain distance between the scraper 2111 and the receiving plate 28, some residual powder will remain on the receiving platform after the powder is spread. By setting a rotating receiving plate 28, after the scraper 2111 moves to the powder spreading platform 29, the collecting box 8 is controlled to open, and the receiving plate 28 is controlled to rotate, so that the residual powder on the receiving plate 28 can enter the collecting box 8. When unloading the material next time, the residual powder can be blown into the collecting box 8 from the connecting pipe 9 into the No. 1 air pipe 258, and then enter the storage chamber 26 of the discharging station from the No. 1 air pipe 258 for recycling, thereby avoiding the problem that the same batch of powder will be accumulated on the receiving plate 28 for a long time and the quality will be reduced, and the powder needs to be processed when it is recycled again.

[0056] like Figure 2 , Figure 3 and Fig.11 As shown, the device also includes a round block 10 rotatably mounted on the side plate 210, and the round block 10 is used to drive the receiving plate 28 to rotate. The scraper 2111 can drive the round block 10 to rotate through friction during the sliding process.

[0057] Specifically, when the scraper 2111 slides on the powder spreading platform 29 in the direction away from the receiving plate 28, it contacts the round block 10, pushes the round block 10 to rotate, and causes the receiving plate 28 to rotate, and pours the remaining powder into the collecting box 8. When the scraper 2111 finishes spreading the powder and slides in the direction close to the receiving plate 28, it contacts the round block 10, pushes the round block 10 to rotate, until the receiving plate 28 is reconnected with the powder spreading platform 29, which is easy to use.

[0058] Working principle: before work, the physical model to be manufactured is imported into the computer, and the computer decomposes the three-dimensional model into several plane layers. During work, the unloading component 25 is controlled to rotate. When the storage chamber 26 moves to the loading station, the storage chamber 26 is connected with the No. 1 cavity 22, so the powder in the No. 1 cavity 22 falls into the storage chamber 26, and the unloading component 25 continues to rotate until the storage chamber 26 leaves the loading station and is disconnected from the No. 1 cavity 22. At this time, the discharge chamber is full of powder, and the unloading component 25 continues to rotate until the storage chamber 26 is located at the discharge station. The unloading component 25 is controlled to stop rotating, and the telescopic plate 252 on the side close to the discharge port slides radially in the direction close to the axis of the circular plate, so that the telescopic plate 252 shrinks, so that the powder can flow into the storage chamber 26 of the unloading station through the shrinking shrinking plate, and the stirring component 27 is controlled to work so that the powder After falling to the unloading station, the stirring component 27 is dispersed in the storage chamber 26 of the entire unloading station, and then the powder falls from the unloading port 24 to the receiving plate 28 under the action of gravity, until all the powder in the storage chamber 26 of the discharge station falls onto the receiving plate 28, and then the leveling component 211 is controlled to slide horizontally to spread the powder on the receiving plate 28 on the forming cylinder 41, and at the same time the unloading component 25 is controlled to rotate so that the storage chamber 26 rotates to the unloading station, and the telescopic plate 252 is controlled to extend until it fits with the inner wall of the second cavity 23, and then the laser unit 3 is controlled to emit a laser beam to scan the cross-section of the model plane layer on the powder. The powder is irradiated by the laser beam, melts and solidifies quickly, and then the forming cylinder 41 is controlled to move downward, and the powder spreading unit 2 is controlled again to spread the powder, and so on, each plane layer of the model is printed from bottom to top to produce a complete physical object.

[0059] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An additive manufacturing molding device, comprising a machine body (1), a powder spreading unit (2), a laser unit (3) and a molding unit (4), wherein the molding unit (4) comprises a molding cylinder (41) slidably mounted inside the machine body (1), characterized in that: The powder spreading unit (2) comprises: A powder box (21) fixedly mounted inside the machine body (1), the powder box (21) comprising a first cavity (22) and a second cavity (23), and a discharge port (24) is provided at the bottom end of the powder box (21); a material unloading assembly (25) installed in the second cavity (23), the material unloading assembly (25) comprising a first rotating shaft (251) rotatably installed in the second cavity (23) and a plurality of telescopic plates (252) fixedly installed on the first rotating shaft (251), the telescopic plates (252) dividing the second cavity (23) into a plurality of material storage cavities (26); a stirring assembly (27) installed in the second cavity (23), the stirring assembly (27) being installed near the discharge port (24), the stirring assembly (27) being used to stir the powder flowing out from the adjacent storage cavity (26), so that the powder is evenly filled in the storage cavity (26) containing the stirring assembly (27), and the powder is discharged from the discharge port (24) under the action of gravity; A receiving plate (28) installed in the machine body (1), the powder discharged from the discharge port (24) falling onto the receiving plate (28); A powder spreading platform (29) fixedly mounted in the machine body (1), the powder spreading platform (29) being mounted in cooperation with the forming cylinder (41); A side plate (210) fixedly mounted inside the machine body (1), a smoothing assembly (211) being slidably mounted on the side plate (210), the smoothing assembly (211) being used to evenly spread the powder in the receiving plate (28) on the forming cylinder (41); The blanking component (25) further comprises: a disc (254) for driving the first rotating shaft (251) to rotate, the disc (254) being rotationally connected to the machine body (1), and the movable end of the telescopic plate (252) being slidably connected to the disc (254); A slide groove (256) is provided on the machine body (1), and the movable end of the telescopic plate (252) is slidably connected to the slide groove (256); The blanking component (25) further comprises: A plurality of ventilation holes (257) are provided on the first rotating shaft (251), wherein the ventilation holes (257) are located between two adjacent telescopic plates (252); A No. 1 air delivery pipe (258) is fixedly installed in the powder box (21), the No. 1 air delivery pipe (258) is rotatably connected to the No. 1 rotating shaft (251), the No. 1 air delivery pipe (258) is communicated with a storage cavity (26) adjacent to the stirring component (27) through the air vent (257), and air is introduced into the storage cavity (26) through the No. 1 air delivery pipe (258) to accelerate the discharge of powder in the storage cavity (26) into the storage cavity (26) containing the stirring component (27); A plurality of filter holes (259) are provided at the movable end of the telescopic plate (252); A sticking plate (2510) slidably mounted on the movable end of the telescopic plate (252), wherein the sticking plate (2510) slides to control whether the filter hole (259) is exposed; An exhaust pipe (2511) is fixedly mounted on the powder box (21), the exhaust pipe (2511) being connected to another storage chamber (26) containing the stirring component (27), the gas in the storage chamber (26) containing the stirring component (27) being discharged from the exhaust pipe (2511) through the filter hole (259), and the powder being discharged from the discharge port (24).

2. The additive manufacturing molding equipment according to claim 1, characterized in that: The stirring assembly (27) comprises: Rotating a second rotating shaft (271) installed in the machine body (1); a slide plate (272) mounted on the second rotating shaft (271), the slide plate (272) being slidably connected to the second rotating shaft (271), and a first spring (275) being mounted between the slide plate (272) and the second rotating shaft (271); A second gas delivery pipe (273) is installed on the powder box (21), and gas enters the second cavity (23) from the second gas delivery pipe (273), so as to blow the slide plate (272) and the second rotating shaft (271) to rotate.

3. The additive manufacturing molding equipment according to claim 2, characterized in that: The stirring assembly (27) further includes an arc plate (274) fixedly mounted in the second cavity (23), and the arc plate (274) is prevented from being in contact with the arc plate (274) during rotation. The arc plate (274) cooperates with the slide plate (272) to prevent the powder from being discharged directly from the discharge port along the inner wall of the second cavity (23).

4. The additive manufacturing molding equipment according to claim 3, characterized in that: The device also includes an arc panel (5) rotatably mounted on the powder box (21), the arc panel (5) being used to push the sticking plate (2510) to slide, the side wall of the arc panel (5) being in contact with the side wall of the second rotating shaft (271), the rotation of the second rotating shaft (271) being able to push the arc panel (5) to rotate, a second spring (6) being installed between the arc panel (5) and the powder box (21), and a third spring (7) being installed between the sticking plate (2510) and the telescopic plate (252).

5. The additive manufacturing molding equipment according to claim 4, characterized in that: When the telescopic plate (252) contracts, the distance between the telescopic plate (252) and the inner wall of the second cavity (23) is smaller than the width of the discharge port.

6. The additive manufacturing molding equipment according to claim 5, characterized in that: The smoothing component (211) comprises a scraper (2111) for spreading powder and an inclined plate (2112) for guiding flow, and the inclined plate (2112) is rotatably connected to the scraper (2111).

7. The additive manufacturing molding equipment according to claim 6, characterized in that: The device also includes a collecting box (8) fixedly mounted on one end of the receiving plate (28) away from the powder spreading platform (29); the receiving plate (28) is rotatably connected to the side plate (210); the receiving plate (28) rotates to pour the remaining powder on the receiving plate (28) into the collecting box (8); the collecting box is connected to a connecting pipe (9), and the connecting pipe (9) is connected to the No. 1 gas pipe (258).

8. The additive manufacturing molding equipment according to claim 7, characterized in that: The device further comprises a round block (10) rotatably mounted on the side plate (210), wherein the round block (10) is used to drive the receiving plate (28) to rotate, and the scraper (2111) can drive the round block (10) to rotate by friction during the sliding process.

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