Metal powder preparation device for 3D printing

Abstract

The invention discloses a metal powder preparation device for 3D printing, and belongs to the technical field of 3D printing metal powder preparation. The metal powder preparation device for 3D printing comprises a preparation shell, and a feeding mechanism is assembled on one side of the top end of the preparation shell; a material conveying mechanism, a material washing mechanism, a material drying mechanism and a rotary heating mechanism are sequentially assembled in the preparation shell from the side close to the feeding mechanism to the side far away from the feeding mechanism, and a follow-up material throwing mechanism is assembled in the preparation shell and located below the rotary heating mechanism; a water atomization mechanism is assembled at the position, located on one side of the follow-up material throwing mechanism, in the preparation shell, a discharging mechanism is assembled at the position, located on the other side of the follow-up material throwing mechanism, in the preparation shell, and a programmable controller is fixedly connected to the outer wall of the operation side of the preparation shell. The material conveying mechanism, the material washing mechanism and the material drying mechanism are arranged, an oxide layer on the surface of a raw material can be fully rolled and dried before the raw material is melted and atomized and spheroidized, and the preparation quality of a metal powder finished product can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printing metal powder preparation, and particularly relates to a device for preparing metal powder for 3D printing. Background Art

[0002] 3D printing, also known as additive manufacturing, refers to the process of constructing an object by stacking materials layer by layer, and has been widely used in fields such as aerospace, medical, automotive, and architecture.

[0003] During the 3D printing process, metal powder is the key raw material, and its quality and performance directly affect the accuracy, strength, and durability of the printed parts. Therefore, the preparation of metal powder is particularly important.

[0004] Chinese Patent Application No. 201920748615.0 discloses a device for preparing metal powder for 3D printing, including an atomization tank. A metal wire feeding mechanism is arranged at the top of the atomization tank. Inside the atomization tank, a material treatment area, a device area, and an atomization area are arranged in sequence from top to bottom. Inside the material treatment area, a wire threading hole, a straightener, a deoxidizing grinding wheel set, and a ceramic protection tube are arranged in sequence from top to bottom. The ceramic protection tube extends to the device area. Inside the device area, a plasma generator is arranged below the ceramic protection tube. Inside the atomization area, an ultrasonic rotating mechanism with a heating mechanism, a gas delivery mechanism, and a powder screening mechanism are arranged in sequence from top to bottom. A vacuum pumping mechanism and a gas recovery and treatment mechanism are respectively arranged on the outer side wall of the atomization tank. When the device prepares metal powder for 3D printing, the vacuum pumping mechanism evacuates the material treatment area, the device area, and the atomization area into a vacuum. The metal wire enters through the wire threading hole, is straightened by the straightener, has its surface deoxidized by the deoxidizing grinding wheel set, is guided to the appropriate position by the ceramic protection tube, and is melted by the plasma generator. The melted metal liquid drips into the ultrasonic rotating mechanism, is thrown out by the rotating ultrasonic rotating mechanism, and forms spherical metal powder under the action of the gas of the gas delivery mechanism and drops to the powder screening mechanism. After being screened by the powder screening mechanism, it is discharged, and the gas is recovered by the gas recovery and treatment mechanism.

[0005] The above technology has the following problems: The existing device for preparing metal powder for 3D printing processes the oxide layer on the surface of the metal wire by grinding with a deoxidizing grinding wheel set, but does not set up a perfect grinding residue treatment structure, resulting in some grinding residues remaining on the surface of the metal wire after grinding, which easily affects the quality of the prepared metal powder.

[0006] In view of this, a device for preparing metal powder for 3D printing is designed to solve the above problems. Summary of the Invention

[0007] To solve the problems raised in the above background art, the present invention provides a device for preparing metal powder for 3D printing, which has the characteristic of improving the quality of the prepared finished metal powder.

[0008] To achieve the above object, the present invention provides the following technical solutions: A metal powder preparation device for 3D printing, comprising: a preparation housing, one side of the top of the preparation housing is equipped with a feeding mechanism, and inside the preparation housing, a feeding mechanism, a washing mechanism, a drying mechanism, and a rotary heating mechanism are successively assembled from the side close to the feeding mechanism to the far side. A follow-up throwing mechanism is assembled below the rotary heating mechanism inside the preparation housing. A water atomization mechanism is assembled on one side of the follow-up throwing mechanism inside the preparation housing, and a discharging mechanism is assembled on the other side of the follow-up throwing mechanism inside the preparation housing. A programmable controller is fixedly connected to the outer wall of the operation side of the preparation housing. The feeding mechanism, the washing mechanism, the rotary heating mechanism, and the water atomization mechanism are electrically connected to the programmable controller.

[0009] Further, the feeding mechanism includes a feeding pipe fixedly connected to one side of the top of the preparation housing. One side of the top of the feeding pipe is rotatably connected to a feeding cover plate through a connecting rotating shaft, and the feeding cover plate covers the feeding pipe.

[0010] Further, the feeding mechanism includes a first side cavity opened inside the preparation housing and a feeding cavity opened inside the preparation housing. The feeding cavity is located on one side of the first side cavity and is communicated with the feeding pipe. A first motor is fixedly connected to the side wall of the first side cavity close to the feeding cavity. Two feeding rollers are arranged inside the feeding cavity. One end of a feeding roller is connected to the output end of the first motor through a coupling, and the other end is connected to the inner wall of the preparation housing through a bearing. One end of the other feeding roller penetrates the preparation housing and extends into the first side cavity. The feeding roller is connected to the penetrating section of the preparation housing through a bearing, and the other end is connected to the inner wall of the preparation housing through a bearing. A friction-driven feeding belt is sleeved on the inner section of the two feeding rollers in the feeding cavity. The first motor is electrically connected to the programmable controller.

[0011] Further, the material washing mechanism includes a clear liquid inlet pipe with an electric valve and a waste liquid outlet pipe with an electric valve fixedly connected inside the preparation housing, a cleaning cavity opened inside the preparation housing on one side of the material conveying cavity, and a second side cavity opened inside the preparation housing. The clear liquid inlet pipe with an electric valve and the waste liquid outlet pipe with an electric valve are arranged in an up-and-down structure. One end of the clear liquid inlet pipe with an electric valve is connected to a liquid supply device, and one end of the waste liquid outlet pipe with an electric valve is connected to a sewage treatment device. The other ends of the clear liquid inlet pipe with an electric valve and the waste liquid outlet pipe with an electric valve are communicated with the cleaning cavity. The cleaning cavity is communicated with the material conveying cavity. The discharging end of the conveying belt extends into the cleaning cavity through a communication port. A number of upwardly inclined material washing rollers are equidistantly arranged below and partially above the cleaning cavity. Some of the material washing rollers above are arranged at the upper inclined section, and cooperate with the material washing rollers below to wash the material and convey it upward. The second side cavity is located on the side of the cleaning cavity away from the first side cavity. One end of the lower material washing roller penetrates the preparation housing and extends into the first side cavity, and the other end of the upper material washing roller penetrates the preparation housing and extends into the second side cavity and is fixedly sleeved with a fourth gear. The material washing roller is connected to the penetrating section of the preparation housing through a bearing. The other end of the lower material washing roller is connected to the inner wall of the preparation housing through a bearing. One end of the upper material washing roller penetrates the preparation housing and extends into the first side cavity. The material washing roller is connected to the penetrating section of the preparation housing through a bearing. One end of the other upper material washing rollers is connected to the inner wall of the preparation housing through a bearing. The inner end of the conveying roller extending into the first side cavity and the section of the lowest lower material washing roller extending into the first side cavity are respectively fixedly sleeved with a first gear. The first gears are far from the fourth gears. A first toothed belt for meshing transmission is sleeved outside the two first gears. The side walls of the first side cavity and the second side cavity close to the cleaning cavity are respectively connected through bearings with a first follower shaft between adjacent two fourth gears. The other end of the first follower shaft is fixedly sleeved with a third gear. The third gear is meshed and connected with the adjacent two fourth gears. A second gear is respectively fixedly sleeved on one of the first follower shafts and the inner end of the upper material washing roller extending into the first side cavity. The second gears are far from the third gears. A second toothed belt for meshing transmission is sleeved outside the two second gears. The clear liquid inlet pipe with an electric valve and the waste liquid outlet pipe with an electric valve are electrically connected to a programmable controller.

[0012] Further, the dry material mechanism includes a dry material cavity opened inside the preparation housing on the side of the cleaning cavity away from the material feeding cavity, and a second follower shaft connected to the side wall of the first side cavity close to the dry material cavity through a bearing. The dry material cavity is communicated with the cleaning cavity. A first material guiding plate is fixedly connected inside the communication port between the cleaning cavity and the dry material cavity. The first material guiding plate guides the materials conveyed by the material washing roller into the dry material cavity. A plurality of parallel dry material rollers are equidistantly arranged below and partially above the inside of the dry material cavity. A plurality of dry material rollers in the partial upper part are arranged in the parallel rear section, and cooperate with the dry material rollers below to dry and convey the materials. One end of the lower dry material roller penetrates through the preparation housing and extends into the first side cavity, and the other end of the upper dry material roller penetrates through the preparation housing and extends into the second side cavity and is fixedly sleeved with an eighth gear. The dry material roller is connected to the penetrating section of the preparation housing through a bearing, and the other end of the lower dry material roller is connected to the inner wall of the preparation housing through a bearing. One end of an upper dry material roller penetrates through the preparation housing and extends into the first side cavity, and the dry material roller is connected to the penetrating section of the preparation housing through a bearing. One ends of the other upper dry material rollers are connected to the inner wall of the preparation housing through a bearing. The other end of the second follower shaft is fixedly sleeved with a fifth gear, and the fifth gear is meshed and connected with the adjacent eighth gear. A third follower shaft is respectively connected to the side wall of the first side cavity close to the dry material cavity between two adjacent eighth gears through a bearing. The other end of the third follower shaft is fixedly sleeved with a seventh gear, and the seventh gear is meshed and connected with two adjacent eighth gears. A sixth gear is fixedly sleeved on one of the third follower shafts and the inner end of the upper dry material roller extending into the first side cavity. On the side of the sixth gear away from the seventh gear, a third toothed belt engaged in transmission is sleeved outside the two sixth gears.

[0013] Further, the rotary heating mechanism includes a rotary seat connected to the top end of the preparation housing through a bearing, a second motor fixedly connected to the top end of the preparation housing, a feeding cavity opened inside the preparation housing on the side of the dry material cavity away from the cleaning cavity, and a heating cavity opened inside the preparation housing below the feeding cavity. A cylinder is fixedly connected to the top end of the rotary seat, and the output end of the cylinder extends into the feeding cavity and is fixedly connected with a heating cover plate. Inside the heating cover plate, a temperature sensor, a vacuum pump, and two symmetric first electric heating rods are fixedly embedded in a staggered manner. An external toothed ring is fixedly sleeved on the upper part outside the heating cover plate. Four insertion rods are fixedly connected to the bottom end of the heating cover plate at equal intervals along the circumference. The second motor is located on one side of the rotary seat, and the output end of the second motor extends into the feeding cavity and is connected to a fourth follower shaft through a coupling. A ninth gear is fixedly sleeved at the bottom end of the fourth follower shaft. Both ends of the feeding cavity are respectively communicated with the dry material cavity and the outside. A second guide plate is fixedly connected inside the communication port between the dry material cavity and the feeding cavity. Closing plates are respectively connected to the side wall of the feeding cavity close to the communication port between the dry material cavity and the feeding cavity and the side wall of the feeding cavity close to the outside through connecting rotating shafts. A heating cylinder is connected to the inside of the preparation housing between the feeding cavity and the heating cavity through a bearing. The second guide plate guides the material conveyed by the dry material roller into the heating cylinder. A support plate is fixedly connected to the upper part of the inner wall of the heating cylinder. Four insertion holes are opened in the support plate at equal intervals along the circumference. A material discharge pipe with an electric valve is fixedly connected to the middle of the bottom end of the heating cylinder. When the cylinder extends and descends, the temperature sensor, the intake end of the vacuum pump, and the first electric heating rods extend into the heating cylinder. The external toothed ring is meshed and connected with the ninth gear. The four insertion rods are inserted into the four insertion holes. The temperature sensor, the vacuum pump, the first electric heating rods, and the material discharge pipe with an electric valve are electrically connected to the programmable controller through a conductive slip ring installed on the cylinder.

[0014] Further, the follow-up type material throwing mechanism includes an inclined material throwing cavity opened inside the preparation housing below the heating cavity and a material throwing cylinder with sieve holes connected to the inside of the preparation housing between the heating cavity and the material throwing cavity through a bearing. The bottom end of the material discharge pipe with an electric valve is fixedly connected and communicated with the top end of the material throwing cylinder with sieve holes. Four connecting rods are fixedly connected to the outer edge of the top end of the material throwing cylinder with sieve holes at equal intervals along the circumference. The top ends of the connecting rods are fixedly connected to the bottom end of the heating cylinder.

[0015] Further, the water atomization mechanism includes a plurality of atomizing nozzles fixedly connected to the side wall of the preparation housing. The plurality of atomizing nozzles are arranged at the inclined upper end of the material throwing cavity and on one side of the material throwing cylinder with sieve holes, and are simultaneously connected to a water supply device.

[0016] Further, the discharging mechanism includes a discharging port opened on the side wall of the preparation housing at the inclined bottom end of the material throwing cavity. A discharging cover plate is connected to the side wall of the discharging port close to the outside through a connecting rotating shaft.

[0017] Furthermore, a heat energy utilization mechanism is assembled inside the preparation housing; The heat energy utilization mechanism includes a first drying cavity opened inside the preparation housing below the cleaning cavity, a second drying cavity opened inside the preparation housing below the dry material cavity, a hot air duct fixedly connected to the side wall of the first side cavity close to the dry material cavity, and a plurality of exhaust ducts with electric valves fixedly embedded inside the preparation housing. The first drying cavity communicates with the material throwing cavity. An installation groove and a blower are respectively arranged inside the first drying cavity from the side close to and away from the communication port between the material throwing cavity and the first drying cavity. The installation groove communicates with the first side cavity. A drying plate is connected inside the installation groove by screws. The second drying cavity communicates with the first drying cavity. A plurality of second electric heating rods are fixedly connected at equal intervals inside the second drying cavity. A plurality of exhaust ducts with electric valves are respectively arranged inside the preparation housing between the dry material cavity and the heating cavity and between the heating cavity and the outside. The blower and the second electric heating rods are electrically connected to the programmable controller.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention is provided with a feeding mechanism, a material washing mechanism and a dry material mechanism, which can fully roll and dry the oxide layer on the surface of the raw material before the raw material is melted and atomized into spherical shapes, and can improve the preparation quality of the finished metal powder.

[0019] 2. The rotary heating mechanism and the follow-up material throwing mechanism provided by the present invention rotate simultaneously under the action of the same driving source. When heating and melting the raw material, the melting effect of the raw material can be improved. When throwing the material to form metal droplets, since it is synchronously thrown with the heated and melted raw material, the time for restarting the throwing is eliminated, and the formation effect and efficiency of the metal droplets can be improved, that is, the preparation quality of the finished metal powder can be improved.

[0020] 3. The present invention is provided with a heat energy utilization mechanism, which can utilize the high temperature in the high-temperature gas containing moisture generated by the contact between the metal droplets and the atomized water droplets to assist the dry material roller in drying the raw material, and at the same time can heat the outer wall of the heating cylinder to assist the first electric heating rod in heating the raw material, reduce the internal and external temperature difference, and improve the melting effect of the raw material. Description of the Drawings

[0021] Figure 1 is a three-dimensional view of the present invention; Figure 2 is a vertical sectional view of the present invention; Figure 3 is another vertical sectional view of the present invention; Figure 4 is another vertical sectional view of the present invention; Figure 5 is a partial structural schematic diagram of the present invention; Figure 6 is a partial structural schematic diagram of the present invention; Figure 7 This is a vertical sectional view of the local structure of the present invention; Figure 8 This is a vertical sectional view of the local structure of the present invention; In the figure: 1. Preparation shell; 2. Programmable controller; 101. Feed pipe; 102. Feed cover plate; 201. First side cavity; 202. First motor; 203. Material conveying cavity; 204. Material conveying roller; 205. Material conveying belt; 301. Sewage outlet pipe with electric valve; 302. Clean liquid inlet pipe with electric valve; 303. Cleaning cavity; 304. Second side cavity; 305. Material washing roller; 306. First gear; 307. Second gear; 308. First toothed belt; 309. Third gear; 310. Second toothed belt; 311. First follower shaft; 312. Fourth gear; 401. First guide plate; 402. Dry material cavity; 403. Dry material roller; 404. Fifth gear; 405. Second follower shaft; 406. Sixth gear; 407. Seventh gear; 408. Third toothed belt; 409. Third follower shaft; 410. Eighth gear; 501. Closing plate; 502. Feed cavity; 503. Heating cavity; 504. Second guide plate; 505. Rotating seat; 506. Second motor; 507. Heating cover plate; 508. Fourth follower shaft; 509. Ninth gear; 510. Heating cylinder; 511. Support plate; 512. Insertion hole; 513. Temperature sensor; 514. External toothed ring; 515. First electric heating rod; 516. Vacuum pump; 517. Electric cylinder; 518. Insertion rod; 519. Material outlet pipe with electric valve; 601. Centrifugal throwing cavity; 602. Centrifugal throwing cylinder with sieve holes; 603. Connecting rod; 701. Atomizing nozzle; 801. Discharge port; 802. Discharge cover plate; 901. Installation groove; 902. Drying plate; 903. Hot air duct; 904. First drying cavity; 905. Exhaust duct with electric valve; 906. Second electric heating rod; 907. Second drying cavity; 908. Fan; 1001. Rotating shaft; 1002. Lock; 1003. Door panel. Detailed implementation manners

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1 The present invention provides the following technical solution: A metal powder preparation device for 3D printing, comprising: a preparation housing 1, a feeding mechanism is assembled on one side of the top end of the preparation housing 1, and a feeding mechanism, a washing mechanism, a drying mechanism, and a rotary heating mechanism are sequentially assembled inside the preparation housing 1 from the side close to the feeding mechanism to the far side. A follow-up type material throwing mechanism is assembled below the rotary heating mechanism inside the preparation housing 1, a water atomization mechanism is assembled on one side of the follow-up type material throwing mechanism inside the preparation housing 1, and a discharging mechanism is assembled on the other side of the follow-up type material throwing mechanism inside the preparation housing 1. A programmable controller 2 is fixedly connected to the outer wall of the operation side of the preparation housing 1, and the feeding mechanism, the washing mechanism, the rotary heating mechanism, and the water atomization mechanism are electrically connected to the programmable controller 2.

[0024] In this embodiment, referring to the attached Figure 3 , when the device prepares metal powder for 3D printing, the raw materials enter the feeding mechanism and then into the feeding mechanism. The feeding mechanism transports the raw materials to the washing mechanism. The washing mechanism washes the raw materials and transports them upward to the drying mechanism at the same time. The drying mechanism dries the washed raw materials and transports them to the rotary heating mechanism at the same time. The rotary heating mechanism rotates and heats the raw materials until the set temperature is reached. The rotary heating mechanism discharges the molten material into the follow-up type material throwing mechanism. The follow-up type material throwing mechanism rotates following the movement, throws the molten raw materials into metal droplets. The metal droplets contact the water mist atomized by the water atomization mechanism to form metal powder for 3D printing, and the formed metal powder for 3D printing is collected by the discharging mechanism.

[0025] Specifically, the feeding mechanism includes a feeding pipe 101 fixedly connected to one side of the top end of the preparation housing 1. One side of the top end of the feeding pipe 101 is rotatably connected to a feeding cover plate 102 through a connecting rotating shaft, and the feeding cover plate 102 covers the upper part of the feeding pipe 101.

[0026] In this embodiment, referring to the attached Figure 3 , the feeding mechanism rotates and opens the feeding cover plate 102 along the connecting rotating shaft and feeds through the feeding pipe 101 to achieve the feeding function.

[0027] Specifically, the feeding mechanism includes a first side cavity 201 opened inside the preparation housing 1 and a feeding cavity 203 opened inside the preparation housing 1. The feeding cavity 203 is located on one side of the first side cavity 201 and communicates with the feed pipe 101. A first motor 202 is fixedly connected to the side wall of the first side cavity 201 close to the feeding cavity 203. Two feeding rollers 204 are arranged inside the feeding cavity 203. One end of a feeding roller 204 is connected to the output end of the first motor 202 through a coupling, and the other end is connected to the inner wall of the preparation housing 1 through a bearing. One end of the other feeding roller 204 penetrates the preparation housing 1 and extends into the first side cavity 201. The feeding roller 204 is connected to the penetrating section of the preparation housing 1 through a bearing, and the other end is connected to the inner wall of the preparation housing 1 through a bearing. A feeding belt 205 for friction drive is sleeved on the inner sections of the two feeding rollers 204 in the feeding cavity 203. The first motor 202 is electrically connected to the programmable controller 2.

[0028] In this embodiment, referring to Figure 2 、 3 and 5, the feeding mechanism is controlled by the programmable controller 2 to start the first motor 202. The first motor 202 drives the output end to rotate. The output end of the first motor 202 drives the connected feeding roller 204 to rotate. The connected feeding roller 204 drives the friction-driven feeding belt 205 to rotate. The feeding belt 205 drives the other feeding roller 204 to rotate. The two feeding rollers 204 then drive the feeding belt 205 to rotate to realize the function of conveying the raw materials dropped on the feeding belt 205 by the feed pipe 101.

[0029] Specifically, the material washing mechanism includes a clear liquid inlet pipe 302 with an electric valve and a waste liquid outlet pipe 301 with an electric valve fixedly connected inside the preparation housing 1, a cleaning cavity 303 opened inside the preparation housing 1 on one side of the material conveying cavity 203, and a second side cavity 304 opened inside the preparation housing 1. The clear liquid inlet pipe 302 with an electric valve and the waste liquid outlet pipe 301 with an electric valve are arranged in an up-and-down structure. One end of the clear liquid inlet pipe 302 with an electric valve is connected to a liquid supply device, and one end of the waste liquid outlet pipe 301 with an electric valve is connected to a sewage treatment device. The other ends of the clear liquid inlet pipe 302 with an electric valve and the waste liquid outlet pipe 301 with an electric valve are communicated with the cleaning cavity 303. The cleaning cavity 303 is communicated with the material conveying cavity 203. The discharging end of the material conveying belt 205 extends into the cleaning cavity 303 through a communication port. A number of upwardly inclined material washing rollers 305 are arranged at equal intervals below and partially above the inside of the cleaning cavity 303. A number of material washing rollers 305 at the partial upper part are arranged at the upper inclined section, and cooperate with the material washing rollers 305 below to wash the materials and convey them upward. The second side cavity 304 is located on the side of the cleaning cavity 303 away from the first side cavity 201. One end of the lower material washing roller 305 penetrates through the preparation housing 1 and extends into the first side cavity 201, and the other end of the upper material washing roller 305 penetrates through the preparation housing 1 and extends into the second side cavity 304 and is fixedly sleeved with a fourth gear 312. The material washing roller 305 is connected to the penetrating section of the preparation housing 1 through a bearing. The other end of the lower material washing roller 305 is connected to the inner wall of the preparation housing 1 through a bearing. One end of an upper material washing roller 305 penetrates through the preparation housing 1 and extends into the first side cavity 201. The material washing roller 305 is connected to the penetrating section of the preparation housing 1 through a bearing. One ends of the other upper material washing rollers 305 are connected to the inner wall of the preparation housing 1 through a bearings. The inner end of the material conveying roller 204 extending into the first side cavity 201 and the section of the lowest lower material washing roller 305 extending into the first side cavity 201 are respectively fixedly sleeved with a first gear 306. The first gears 306 are far from the fourth gear 312. A first toothed belt 308 for meshing transmission is sleeved outside the two first gears 306. The side walls of the first side cavity 201 and the second side cavity 304 close to the cleaning cavity 303 are respectively connected with a first follower shaft 311 through a bearing between two adjacent fourth gears 312. The other end of the first follower shaft 311 is fixedly sleeved with a third gear 309. The third gear 309 is meshed and connected with two adjacent fourth gears 312. A second gear 307 is fixedly sleeved on one of the first follower shafts 311 and the inner end of the upper material washing roller 305 extending into the first side cavity 201. The second gears 307 are far from the third gear 309 side. A second toothed belt 310 for meshing transmission is sleeved outside the two second gears 307. The clear liquid inlet pipe 302 with an electric valve and the waste liquid outlet pipe 301 with an electric valve are electrically connected to the programmable controller 2.

[0030] In this embodiment, refer to the attached Figure 2-5, the material washing mechanism controls the electric valve of the clear liquid inlet pipe 302 with an electric valve to open by a programmable controller 2. The liquid supply device injects clear liquid into the cleaning cavity 303 through the clear liquid inlet pipe 302 with an electric valve until the set amount, and then controls the electric valve of the clear liquid inlet pipe 302 with an electric valve to close. The supplied liquid has the characteristics of simultaneously meeting the deoxidation effect, lubrication and antifriction, corrosion prevention, and process compatibility, including but not limited to abrasive water suspension; The rotating material conveying roller 204 drives the connected first gear 306 to rotate. The connected first gear 306 drives the first toothed belt 308 in meshing transmission to rotate. The first toothed belt 308 drives another meshing-connected first gear 306 to rotate. Another connected first gear 306 drives the connected material washing roller 305 to rotate. The connected material washing roller 305 drives the connected fourth gear 312 to rotate. The connected fourth gear 312 drives the meshing-connected third gear 309 to rotate. The meshing-connected third gear 309 drives another meshing-connected fourth gear 312 to rotate. Another meshing-connected fourth gear 312 drives the connected material washing roller 305 to rotate, and so on, to achieve the same-direction rotation of several material washing rollers 305 below; The rotating third gear 309 drives the connected first follower shaft 311 to rotate. The connected first follower shaft 311 drives the connected second gear 307 to rotate. The connected second gear 307 drives the second toothed belt 310 in meshing transmission connection to rotate. The second toothed belt 310 drives another meshing-connected second gear 307 to rotate. Another meshing-connected second gear 307 drives the connected material washing roller 305 to rotate. The connected material washing roller 305 drives the connected fourth gear 312 to rotate. The connected fourth gear 312 drives the meshing-connected third gear 309 to rotate. The meshing-connected third gear 309 drives another meshing-connected fourth gear 312 to rotate. Another meshing-connected fourth gear 312 drives the connected material washing roller 305 to rotate, and so on, to achieve the same-direction rotation of several material washing rollers 305 above, and the opposite-direction rotation of the material washing rollers 305 above and below; The material washing rollers 305 below and above are partially located below the water surface and partially located above the water surface; The raw materials conveyed by the conveying belt 205 fall on the lowest material washing roller 305 below. The several rotating material washing rollers 305 below convey the raw materials upward. During the raw material conveying process, the raw materials enter the area of the material washing rollers 305 above. The material washing rollers 305 above and below cooperate to convey the raw materials upward. During the upward conveying process of the raw materials, they continuously roll and contact with the upper and lower material washing rollers 305 for deoxidation, improving the surface cleaning effect of the raw materials; After cleaning, control the electric valve of the dirty liquid outlet pipe 301 with an electric valve to open, and the dirty liquid is discharged through the dirty liquid outlet pipe 301 with an electric valve.

[0031] Specifically, the drying mechanism includes a drying chamber 402 opened inside the preparation shell 1 and located on the side of the cleaning chamber 303 away from the feeding chamber 203, and a second follower shaft 405 connected to the side wall of the first side chamber 201 close to the drying chamber 402 through a bearing. The drying chamber 402 is connected to the cleaning chamber 303, and a first guide plate 401 is fixed inside the communication port between the cleaning chamber 303 and the drying chamber 402. The first guide plate 401 guides the material conveyed by the washing roller 305 to the inside of the drying chamber 402, and the drying chamber 402 is connected to the first side chamber 201. A plurality of parallel drying rollers 403 are arranged at equal intervals at the lower part and partially at the upper part of the cavity 402. A plurality of drying rollers 403 are arranged at the rear section in parallel, and cooperate with the plurality of drying rollers 403 at the lower part to dry and transport the materials. One end of the lower drying roller 403 passes through the preparation shell 1 and extends into the first side cavity 201, and the other end of the upper drying roller 403 passes through the preparation shell 1 and extends into the second side cavity 304 and is fixedly sleeved with an eighth gear 410. The drying roller 403 is connected to the through section of the preparation shell 1 through a bearing. The other end of the dry material roller 403 is connected to the inner wall of the preparation shell 1 through a bearing, one end of the upper dry material roller 403 penetrates the preparation shell 1 and extends into the first side cavity 201, the dry material roller 403 is connected to the through section of the preparation shell 1 through a bearing, and one end of the other dry material roller 403 above is connected to the inner wall of the preparation shell 1 through a bearing, and the other end of the second follower shaft 405 is fixedly sleeved with a fifth gear 404, and the fifth gear 404 is meshed and connected with the adjacent eighth gear 410, and the first side cavity 201 is close to the side wall of the dry material cavity 402 A third follower shaft 409 is connected between two adjacent eighth gears 410 through bearings, and the other end of the third follower shaft 409 is fixedly sleeved with a seventh gear 407. The seventh gear 407 is meshingly connected to the two adjacent eighth gears 410. A sixth gear 406 is fixedly sleeved on a third follower shaft 409 and on the upper dry material roller 403 extending to the inner end of the first side cavity 201, and the sixth gear 406 is away from the seventh gear 407. The outer surfaces of the two sixth gears 406 are meshingly connected with a third toothed belt 408.

[0032] In this embodiment, see the attached Figure 2-5 The drying mechanism is driven by the rotating fourth gear 312 to drive the meshing fifth gear 404 to rotate, the fifth gear 404 drives the meshing eighth gear 410 to rotate, the meshing eighth gear 410 drives the connected drying roller 403 and the meshing seventh gear 407 to rotate, the meshing seventh gear 407 drives another meshing eighth gear 410 to rotate, another meshing eighth gear 410 drives the connected drying roller 403 to rotate, and so on, so as to realize the same direction rotation of the plurality of drying rollers 403 below, where the drying roller 403 adopts a felt roller with a liquid-wetting function; The rotating seventh gear 407 drives the connected third follower shaft 409 to rotate. The connected third follower shaft 409 drives the connected sixth gear 406 to rotate. The connected sixth gear 406 drives the engaged and driven third toothed belt 408 to rotate. The third toothed belt 408 drives another engaged sixth gear 406 to rotate. The another engaged sixth gear 406 drives the connected upper dry material roller 403 to rotate. The connected upper dry material roller 403 drives the connected eighth gear 410 to rotate. The connected eighth gear 410 drives the engaged seventh gear 407 to rotate. The engaged seventh gear 407 drives another engaged eighth gear 410 to rotate. The another eighth gear 410 drives the connected dry material roller 403 to rotate, and so on, to achieve the co-rotation of several upper dry material rollers 403 in the same direction, and the opposite rotation of the upper and lower dry material rollers 403; The raw materials conveyed by several washing material rollers 305 fall onto the lowermost and outermost dry material roller 403 below through the first guide plate 401. The several rotating dry material rollers 403 below convey the raw materials. During the raw material conveying process, the raw materials enter the area of the upper dry material rollers 403. The upper and lower dry material rollers 403 cooperate to convey the raw materials, and the raw materials are continuously in rolling contact with the upper and lower dry material rollers 403 during the conveying process for drying.

[0033] Specifically, the rotary heating mechanism includes a rotating base 505 connected to the top end of the preparation housing 1 through a bearing, a second motor 506 fixedly connected to the top end of the preparation housing 1, a feeding cavity 502 opened inside the preparation housing 1 on the side of the dry material cavity 402 away from the cleaning cavity 303, and a heating cavity 503 opened inside the preparation housing 1 below the feeding cavity 502. An electric cylinder 517 is fixedly connected to the top end of the rotating base 505. The output end of the electric cylinder 517 extends into the feeding cavity 502 and is fixedly connected with a heating cover plate 507. A temperature sensor 513, a vacuum pump 516, and two symmetric first electric heating rods 515 are fixedly embedded in the heating cover plate 507 in a staggered manner. An external toothed ring 514 is fixedly sleeved on the upper part of the outer side of the heating cover plate 507. Four insertion rods 518 are fixedly connected to the bottom end of the heating cover plate 507 at equal intervals along the circumferential direction. The second motor 506 is located on one side of the rotating base 505. The output end of the second motor 506 extends into the feeding cavity 502 and is connected with a fourth follower shaft 508 through a coupling. A ninth gear 509 is fixedly sleeved at the bottom end of the fourth follower shaft 508. Both ends of the feeding cavity 502 are respectively communicated with the dry material cavity 402 and the outside. A second guide plate 504 is fixedly connected inside the communication port between the dry material cavity 402 and the feeding cavity 502. Closing plates 501 are respectively connected to the side wall of the feeding cavity 502 near the communication port between the dry material cavity 402 and the feeding cavity 502 and the side wall of the feeding cavity 502 near the outside through connecting rotating shafts. A heating cylinder 510 is connected to the inside of the preparation housing 1 between the feeding cavity 502 and the heating cavity 503 through a bearing. The second guide plate 504 guides the materials conveyed by the dry material roller 403 into the heating cylinder 510. A support plate 511 is fixedly connected to the upper part of the inner wall of the heating cylinder 510. Four insertion holes 512 are opened in the support plate 511 at equal intervals along the circumferential direction. A material outlet pipe 519 with an electric valve is fixedly connected to the middle of the bottom end of the heating cylinder 510. When the electric cylinder 517 extends and descends, the temperature sensor 513, the intake end of the vacuum pump 516, and the first electric heating rods 515 extend into the heating cylinder 510. The external toothed ring 514 is meshed and connected with the ninth gear 509. The four insertion rods 518 are inserted into the four insertion holes 512. The temperature sensor 513, the vacuum pump 516, the first electric heating rods 515, and the material outlet pipe 519 with an electric valve are electrically connected to the programmable controller 2 through a conductive slip ring installed on the electric cylinder 517.

[0034] In this embodiment, refer to the attached Figure 3 、 6, 7 and 8, for the rotary heating mechanism, the raw materials conveyed by several dry material rollers 403 fall into the heating cylinder 510 through the closing plate 501. The programmable controller 2 controls the electric cylinder 517 to start. The electric cylinder 517 drives the extension of the output end. The output end of the electric cylinder 517 drives the heating cover plate 507 to move downward until it stops after reaching the set time. At this time, the four plug rods 518 are inserted into the four plug holes 512. The temperature sensor 513, the intake end of the vacuum pump 516, and the first electric heating rod 515 extend into the heating cylinder 510. The external gear ring 514 is meshed and connected with the ninth gear 509. Control the vacuum pump 516 to start. The vacuum pump 516 evacuates the heating cylinder 510 into a vacuum. Control the temperature sensor 513, the first electric heating rod 515, and the second motor 506 to start. Several first electric heating rods 515 generate heat to melt the raw materials. The second motor 506 drives the rotation of the output end. The output end of the second motor 506 drives the fourth follower shaft 508 to rotate. The fourth follower shaft 508 drives the ninth gear 509 to rotate. The ninth gear 509 drives the meshed external gear ring 514 to rotate. The external gear ring 514 drives the heating cover plate 507 to rotate. The heating cover plate 507 drives the heating cylinder 510 to rotate due to the limitation of the plug rod 518 and the plug hole 512. During the rotation of the heating cylinder 510, the heated raw materials move in the heating cylinder 510 to improve the melting effect of the raw materials. The temperature sensor 513 monitors the temperature of the molten raw materials in real time. Until the set temperature value is reached, control the electric valve of the discharge pipe 519 with an electric valve to open. The molten material is discharged from the discharge pipe 519 with an electric valve to achieve heating and melting.

[0035] Specifically, the follow-up type material throwing mechanism includes an inclined material throwing cavity 601 opened inside the preparation housing 1 below the heating cavity 503 and a screen hole material throwing cylinder 602 connected by bearings inside the preparation housing 1 between the heating cavity 503 and the material throwing cavity 601. The bottom end of the discharge pipe 519 with an electric valve is fixedly connected and communicated with the top end of the screen hole material throwing cylinder 602. Four connecting rods 603 are fixedly connected along the circumferential direction at equal intervals on the outer edge of the top end of the screen hole material throwing cylinder 602. The top ends of the connecting rods 603 are fixedly connected with the bottom end of the heating cylinder 510.

[0036] In this embodiment, refer to the appendix Figure 3 、 6At 8, the follow-up type material throwing mechanism discharges the molten material in the heating cylinder body 510 to the material throwing cylinder body 602 with sieve holes through the material discharging pipe 519 with an electric valve. The vacuum pump 516 is controlled to start. The vacuum pump 516 evacuates the heating cylinder body 510 and the inclined material throwing cavity 601 into a vacuum. The rotating heating cylinder body 510 drives the material throwing cylinder body 602 with sieve holes to rotate through four connecting rods 603. During the rotation of the material throwing cylinder body 602 with sieve holes, the molten material is thrown out through the sieve holes to form metal droplets. The metal droplets contact the water mist atomized by the water atomization mechanism to be spheroidized to form metal powder, which drops into the inclined material throwing cavity 601 and rolls along the inclined arc of the inclined material throwing cavity 601 to the side of the material discharging mechanism, waiting to be collected.

[0037] Specifically, the water atomization mechanism includes a plurality of atomizing nozzles 701 fixedly connected to the side wall of the preparation housing 1. The plurality of atomizing nozzles 701 are arranged at the inclined upper end of the material throwing cavity 601 and on one side of the material throwing cylinder body 602 with sieve holes, and are connected to the water supply device at the same time.

[0038] In this embodiment, refer to the appendix Figure 3 The water atomization mechanism supplies water into the plurality of atomizing nozzles 701 by the water supply mechanism, and the plurality of atomizing nozzles 701 atomize the water into water droplets to achieve water atomization.

[0039] Specifically, the material discharging mechanism includes a material discharging port 801 opened on the side wall of the preparation housing 1 at the inclined bottom end of the material throwing cavity 601. The material discharging port 801 is connected to a material discharging cover plate 802 through a connecting rotating shaft near the outer side wall.

[0040] In this embodiment, refer to the appendix Figure 3 The material discharging mechanism rotates the material discharging cover plate 802 along the connecting rotating shaft to collect the metal powder through the material discharging port 801.

[0041] Embodiment 2 The difference between this embodiment and Embodiment 1 is that: Specifically, a heat energy utilization mechanism is assembled inside the preparation housing 1; The thermal energy utilization mechanism includes a first drying cavity 904 opened inside the preparation housing 1 below the cleaning cavity 303, a second drying cavity 907 opened inside the preparation housing 1 below the dry material cavity 402, a hot air duct 903 fixedly connected to the side wall of the first side cavity 201 close to the dry material cavity 402, and a number of exhaust ducts 905 with electric valves fixedly embedded inside the preparation housing 1. The first drying cavity 904 is communicated with the material throwing cavity 601. Inside the first drying cavity 904, an installation groove 901 and a blower 908 are respectively arranged from near to far away from the communication port side of the material throwing cavity 601 and the first drying cavity 904. The installation groove 901 is communicated with the first side cavity 201. A drying plate 902 is connected inside the installation groove 901 by screws. The second drying cavity 907 is communicated with the first drying cavity 904. A number of second electric heating rods 906 are fixedly connected at equal intervals inside the second drying cavity 907. A number of exhaust ducts 905 with electric valves are respectively arranged inside the preparation housing 1 between the dry material cavity 402 and the heating cavity 503 and between the heating cavity 503 and the outside. The blower 908 and the second electric heating rods 906 are electrically connected to the programmable controller 2.

[0042] In this embodiment, referring to the attached Figure 2 and 3 , the thermal energy utilization mechanism is controlled by the programmable controller 2 to start the blower 908. The blower 908 sucks the moisture-containing high-temperature gas in the material throwing cavity 601 into the first drying cavity 904 through the communication port between the material throwing cavity 601 and the first drying cavity 904. The moisture-containing high-temperature gas contacts the drying plate 902 in the first drying cavity 904 to dry most of the moisture. The dried high-temperature gas enters the second drying cavity 907 through the communication port between the second drying cavity 907 and the first drying cavity 904. Control a number of second electric heating rods 906 to start. A number of second electric heating rods 906 heat to generate heat to dry the remaining moisture of the high-temperature gas again. The dried high-temperature gas enters the dry material cavity 402 through the hot air duct 903 to cooperate with the dry material roller 403 to dry the raw material, improving the drying effect of the raw material; Control the electric valves of a number of exhaust ducts 905 with electric valves between the dry material cavity 402 and the heating cavity 503 to open. The high-temperature gas after drying the raw material enters the heating cavity 503 through a number of exhaust ducts 905 with electric valves, and can cooperate with the first electric heating rod 515 to heat the raw material, improving the heating effect and rate of the raw material; Control the electric valves of a number of exhaust ducts 905 with electric valves between the heating cavity 503 and the outside to open. The air after thermal energy utilization is discharged through a number of exhaust ducts 905 with electric valves; One end of the above installation groove 901 close to the first side cavity 201 is open, which is convenient for replacing the drying plate 902; The above drying plate 902 is a hollow plate body, with filters provided on both sides of the hollow part, and a desiccant is filled between the two filters.

[0043] Embodiment III The difference between this embodiment and Embodiment II is as follows: On the sides of the first side cavity 201 and the second side cavity 304 that are away from each other, two door panels 1003 are symmetrically provided respectively. A rotating shaft 1001 is rotatably connected between the sides of the two door panels 1003 that are away from each other and the preparation housing 1, and a lock 1002 is connected in an opening and closing manner between the sides of the two door panels 1003 that are close to each other.

[0044] In this embodiment, referring to the attached Figure 4 , unlock the lock 1002, rotate the two door panels 1003 along the two rotating shafts 1001 to open them, and the structures in the first side cavity 201 and the second side cavity 304 can be maintained or repaired, which is convenient and fast.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing metal powder for 3D printing, characterized in that , comprising: a preparation housing (1), one side of the top end of the preparation housing (1) is equipped with a feeding mechanism, and inside the preparation housing (1), a feeding conveyor mechanism, a material washing mechanism, a dry material mechanism, and a rotary heating mechanism are sequentially installed from the side close to the feeding mechanism to the side far from it. A follow-up material throwing mechanism is installed below the rotary heating mechanism inside the preparation housing (1). A water atomization mechanism is installed on one side of the follow-up material throwing mechanism inside the preparation housing (1), and a discharging mechanism is installed on the other side of the follow-up material throwing mechanism inside the preparation housing (1). A programmable controller (2) is fixedly connected to the outer wall of the operation side of the preparation housing (1), and the feeding conveyor mechanism, the material washing mechanism, the rotary heating mechanism, and the water atomization mechanism are electrically connected to the programmable controller (2).

2. The metal powder preparation device for 3D printing according to claim 1, characterized in that: The feeding mechanism includes a feeding pipe (101) fixedly connected to one side of the top end of the preparation housing (1). One side of the top end of the feeding pipe (101) is rotatably connected to a feeding cover plate (102) through a connecting rotating shaft, and the feeding cover plate (102) covers the upper part of the feeding pipe (101).

3. The metal powder preparation device for 3D printing according to claim 2, characterized in that: The feeding conveyor mechanism includes a first side cavity (201) opened inside the preparation housing (1) and a feeding cavity (203) opened inside the preparation housing (1). The feeding cavity (203) is located on one side of the first side cavity (201) and is communicated with the feeding pipe (101). A first motor (202) is fixedly connected to the side wall of the first side cavity (201) close to the feeding cavity (203). Two feeding rollers (204) are arranged inside the feeding cavity (203). One end of a feeding roller (204) is connected to the output end of the first motor (202) through a coupling, and the other end is connected to the inner wall of the preparation housing (1) through a bearing. One end of the other feeding roller (204) penetrates through the preparation housing (1) and extends into the first side cavity (201). The feeding roller (204) is connected to the penetrating section of the preparation housing (1) through a bearing, and the other end is connected to the inner wall of the preparation housing (1) through a bearing. A friction-driven feeding belt (205) is sleeved on the inner section of the two feeding rollers (204) in the feeding cavity (203). The first motor (202) is electrically connected to the programmable controller (2).

4. A metal powder preparation device for 3D printing according to claim 3, characterized in that: The cleaning mechanism includes a cleaned liquid inlet pipe with an electric valve (302) and a sewage outlet pipe with an electric valve (301) fixedly connected inside the preparation housing (1), a cleaning chamber (303) opened inside the preparation housing (1) on one side of the material conveying chamber (203), and a second side chamber (304) opened inside the preparation housing (1). The cleaned liquid inlet pipe with an electric valve (302) and the sewage outlet pipe with an electric valve (301) are arranged in an up-and-down structure. One end of the cleaned liquid inlet pipe with an electric valve (302) is connected to a liquid supply device, and one end of the sewage outlet pipe with an electric valve (301) is connected to a sewage treatment device. The other ends of the cleaned liquid inlet pipe with an electric valve (302) and the sewage outlet pipe with an electric valve (301) are communicated with the cleaning chamber (303). The cleaning chamber (303) is communicated with the material conveying chamber (203). The discharging end of the material conveying belt (205) extends into the cleaning chamber (303) through a communication port. A number of cleaning rollers (305) inclined upward are equidistantly arranged below and partially above the inside of the cleaning chamber (303). A number of cleaning rollers (305) at the partial upper part are arranged at the inclined upper section, and cooperate with the cleaning rollers (305) below to clean the materials and convey them upward. The second side chamber (304) is located on the side of the cleaning chamber (303) away from the first side chamber (201). One end of the lower cleaning roller (305) penetrates through the preparation housing (1) and extends into the first side chamber (201), and the other end of the upper cleaning roller (305) penetrates through the preparation housing (1) and extends into the second side chamber (304) and is fixedly sleeved with a fourth gear (312). The cleaning roller (305) is connected to the penetrating section of the preparation housing (1) through a bearing. The other end of the lower cleaning roller (305) is connected to the inner wall of the preparation housing (1) through a bearing. One end of the upper cleaning roller (305) penetrates through the preparation housing (1) and extends into the first side chamber (201). The cleaning roller (305) is connected to the penetrating section of the preparation housing (1) through a bearing. One ends of the other upper cleaning rollers (305) are connected to the inner wall of the preparation housing (1) through a bearing. The inner end of the material conveying roller (204) extending into the first side chamber (201) and the inner section of the lowest lower cleaning roller (305) extending into the first side chamber (201) are respectively fixedly sleeved with a first gear (306). The first gear (306) is far away from the fourth gear (312). A first toothed belt (308) for meshing transmission is sleeved outside the two first gears (306). First follower shafts (311) are respectively connected to the side walls of the first side chamber (201) and the second side chamber (304) close to the cleaning chamber (303) through bearings between adjacent two fourth gears (312). A third gear (309) is fixedly sleeved at the other end of the first follower shaft (311). The third gear (309) is meshed and connected with the adjacent two fourth gears (312). A second gear (307) is fixedly sleeved on one of the first follower shafts (311) and the inner end of the upper cleaning roller (305) extending into the first side chamber (201).On the side of the second gear (307) away from the third gear (309), a second toothed belt (310) for meshing transmission is sleeved outside the two second gears (307), and the belt electric valve clean liquid inlet pipe (302) and the belt electric valve dirty liquid outlet pipe (301) are electrically connected to the programmable controller (2).

5. The metal powder preparation device for 3D printing according to claim 4, characterized in that: The dry material mechanism includes a dry material cavity (402) opened inside the preparation housing (1) on the side of the cleaning cavity (303) away from the material conveying cavity (203), and a second follower shaft (405) connected to the side wall of the first side cavity (201) close to the dry material cavity (402) through a bearing. The dry material cavity (402) is communicated with the cleaning cavity (303). A first material guide plate (401) is fixedly connected inside the communication port between the cleaning cavity (303) and the dry material cavity (402). The first material guide plate (401) guides the materials conveyed by the material washing roller (305) into the dry material cavity (402). A number of parallel dry material rollers (403) are equidistantly arranged below and partially above the inside of the dry material cavity (402). A number of dry material rollers (403) in the partial upper part are arranged in the parallel rear section, and cooperate with the dry material rollers (403) below to dry and convey the materials. One end of the lower dry material roller (403) penetrates through the preparation housing (1) and extends into the first side cavity (201), and the other end of the upper dry material roller (403) penetrates through the preparation housing (1) and extends into the second side cavity (304) and is fixedly sleeved with an eighth gear (410). The dry material roller (403) is connected to the penetrating section of the preparation housing (1) through a bearing. The other end of the lower dry material roller (403) is connected to the inner wall of the preparation housing (1) through a bearing. One end of an upper dry material roller (403) penetrates through the preparation housing (1) and extends into the first side cavity (201). The dry material roller (403) is connected to the penetrating section of the preparation housing (1) through a bearing. One ends of the other upper dry material rollers (403) are connected to the inner wall of the preparation housing (1) through a bearing. The other end of the second follower shaft (405) is fixedly sleeved with a fifth gear (404). The fifth gear (404) is meshed and connected with the adjacent eighth gear (410). Third follower shafts (409) are respectively connected to the side wall of the first side cavity (201) close to the dry material cavity (402) between two adjacent eighth gears (410) through bearings. The other end of the third follower shaft (409) is fixedly sleeved with a seventh gear (407). The seventh gear (407) is meshed and connected with two adjacent eighth gears (410). Sixth gears (406) are respectively fixedly sleeved on one of the third follower shafts (409) and the inner ends of the upper dry material rollers (403) extending into the first side cavity (201). On the side of the sixth gear (406) away from the seventh gear (407), a third toothed belt (408) engaged in transmission is sleeved outside the two sixth gears (406).

6. The metal powder preparation device for 3D printing according to claim 5, wherein: The rotary heating mechanism includes a rotary seat (505) connected to the top end of the preparation housing (1) through a bearing, a second motor (506) fixedly connected to the top end of the preparation housing (1), a feed cavity (502) opened inside the preparation housing (1) on the side of the dry material cavity (402) away from the cleaning cavity (303), and a heating cavity (503) opened inside the preparation housing (1) below the feed cavity (502). A cylinder (517) is fixedly connected to the top end of the rotary seat (505), and the output end of the cylinder (517) extends into the feed cavity (502) and is fixedly connected with a heating cover plate (507). A temperature sensor (513), a vacuum pump (516), and two symmetric first electric heating rods (515) are fixedly and staggeredly embedded inside the heating cover plate (507). An external toothed ring (514) is fixedly sleeved on the upper part outside the heating cover plate (507). Four insertion rods (518) are fixedly connected to the bottom end of the heating cover plate (507) at equal circumferential intervals. The second motor (506) is located on one side of the rotary seat (505), and the output end of the second motor (506) extends into the feed cavity (502) and is connected with a fourth follower shaft (508) through a coupling. A ninth gear (509) is fixedly sleeved at the bottom end of the fourth follower shaft (508). Both ends of the feed cavity (502) are communicated with the dry material cavity (402) and the outside respectively. A second guide plate (504) is fixedly connected inside the communication port between the dry material cavity (402) and the feed cavity (502). Closing plates (501) are respectively connected through connecting rotating shafts at the side wall of the feed cavity (502) near the communication port between the dry material cavity (402) and the feed cavity (502) and at the side wall of the feed cavity (502) near the outside. A heating cylinder (510) is connected through a bearing inside the preparation housing (1) between the feed cavity (502) and the heating cavity (503). The second guide plate (504) guides the material conveyed by the dry material roller (403) into the heating cylinder (510). A support plate (511) is fixedly connected to the upper part of the inner wall of the heating cylinder (510). Four insertion holes (512) are opened at equal circumferential intervals inside the support plate (511). A material outlet pipe (519) with an electric valve is fixedly connected to the middle of the bottom end of the heating cylinder (510). When the cylinder (517) extends and descends, the temperature sensor (513), the intake end of the vacuum pump (516), and the first electric heating rods (515) extend into the heating cylinder (510). The external toothed ring (514) is meshed and connected with the ninth gear (509). The four insertion rods (518) are inserted into the four insertion holes (512). The temperature sensor (513), the vacuum pump (516), the first electric heating rods (515), and the material outlet pipe (519) with an electric valve are electrically connected to the programmable controller (2) through a conductive slip ring installed on the cylinder (517).

7. The metal powder preparation device for 3D printing according to claim 6, characterized in that: The follow-up type material throwing mechanism includes an inclined material throwing cavity (601) opened inside the preparation housing (1) and below the heating cavity (503), and a screen-hole material throwing cylinder body (602) connected by bearings inside the preparation housing (1) and between the heating cavity (503) and the material throwing cavity (601). The bottom end of the material discharge pipe (519) with an electric valve is fixedly connected and communicated with the top end of the screen-hole material throwing cylinder body (602). Four connecting rods (603) are fixedly connected at equal intervals along the circumferential direction on the outer edge of the top end of the screen-hole material throwing cylinder body (602), and the top ends of the connecting rods (603) are fixedly connected with the bottom end of the heating cylinder body (510).

8. A metal powder preparation device for 3D printing according to claim 7, characterized in that: The water atomization mechanism includes a plurality of atomizing nozzles (701) fixedly connected to the side wall of the preparation housing (1). The plurality of atomizing nozzles (701) are arranged at the inclined upper end of the material throwing cavity (601) and on one side of the screen-hole material throwing cylinder body (602), and are connected to the water supply device at the same time.

9. The metal powder preparation device for 3D printing according to claim 8, characterized in that: The discharging mechanism includes a discharge port (801) opened on the side wall of the preparation housing (1) at the inclined bottom end of the material throwing cavity (601). A discharge cover plate (802) is connected to the side wall close to the outside through a connecting rotating shaft at the discharge port (801).

10. A metal powder preparation device for 3D printing according to claim 9, characterized in that: A heat energy utilization mechanism is assembled inside the preparation housing (1); The heat energy utilization mechanism includes a first drying cavity (904) opened inside the preparation housing (1) and below the cleaning cavity (303), a second drying cavity (907) opened inside the preparation housing (1) and below the dry material cavity (402), a hot air pipeline (903) fixedly connected to the side wall of the first side cavity (201) close to the dry material cavity (402), and a plurality of exhaust pipelines (905) with electric valves fixedly embedded inside the preparation housing (1). The first drying cavity (904) is communicated with the material throwing cavity (601). An installation groove (901) and a blower (908) are respectively arranged inside the first drying cavity (904) from the side close to the communication port between the material throwing cavity (601) and the first drying cavity (904) to the far side. The installation groove (901) is communicated with the first side cavity (201). A drying plate (902) is connected by screws inside the installation groove (901). The second drying cavity (907) is communicated with the first drying cavity (904). A plurality of second electric heating rods (906) are fixedly connected at equal intervals inside the second drying cavity (907). The plurality of exhaust pipelines (905) with electric valves are respectively arranged inside the preparation housing (1) between the dry material cavity (402) and the heating cavity (503) and between the heating cavity (503) and the outside. The blower (908) and the second electric heating rods (906) are electrically connected to the programmable controller (2).

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