阅读说明：本技术 一种梯度材料结构激光熔化沉积成形用自动混粉装置 (Automatic powder mixing device for gradient material structure laser melting deposition forming ) 是由 罗志伟 严振宇 周庆军 王福德 倪江涛 孙国辉 陈靖 孙宏波 于 2020-12-03 设计创作，主要内容包括：本发明涉及3D打印领域,特别是一种梯度材料结构激光熔化沉积成形用自动混粉装置,包括送粉器和送粉头,还包括供粉组件、调配组件和回收组件,所述供粉组件安装于调配组件顶部,供粉组件的一端延伸至调配组件内,调配组件安装于回收组件的顶部,送粉头安装于送粉器的一端且送粉器的一端延伸至调配组件的下段。本发明通过阻挡电机驱动旋转轴使阻挡圆盘旋转控制第一供料罐和第二供料罐的通断,从而使第一供料罐和第二供料罐内不同的粉料依次进入Y型管内,通过Y型管逐层在配比箱内堆叠形成层次,通过阻挡圆盘的转动控制第一供料罐或第二供料罐内的粉料进入Y型管内的量,从而避免不同粉料用量配比错误导致烧结的产品质量以及强度达不到标准。(The invention relates to the field of 3D printing, in particular to an automatic powder mixing device for laser melting deposition forming of a gradient material structure, which comprises a powder feeder and a powder feeding head, and further comprises a powder supply assembly, a blending assembly and a recovery assembly, wherein the powder supply assembly is arranged at the top of the blending assembly, one end of the powder supply assembly extends into the blending assembly, the blending assembly is arranged at the top of the recovery assembly, the powder feeding head is arranged at one end of the powder feeder, and one end of the powder feeder extends to the lower section of the blending assembly. According to the invention, the blocking motor drives the rotating shaft to enable the blocking disc to rotate to control the on-off of the first feeding tank and the second feeding tank, so that different powder materials in the first feeding tank and the second feeding tank sequentially enter the Y-shaped pipe, the Y-shaped pipes are stacked in the proportioning box layer by layer to form layers, and the amount of the powder materials in the first feeding tank or the second feeding tank entering the Y-shaped pipe is controlled by the rotation of the blocking disc, so that the problem that the quality and the strength of sintered products cannot reach the standard due to the wrong proportioning of the different powder material amounts is avoided.)

1. The utility model provides a gradient material structure laser melting deposition takes shape with automatic powder device that mixes, includes powder feeder (5) and send whitewashed head (4), its characterized in that: still including supplying powder subassembly (1), allotment subassembly (2) and recovery subassembly (3), supply powder subassembly (1) to install in allotment subassembly (2) top, supply the one end of powder subassembly (1) to extend to in allotment subassembly (2), allotment subassembly (2) are installed in the top of recovery subassembly (3), send powder head (4) to install in the one end of powder feeder (5) and the other end of powder feeder (5) extends to the hypomere of allotment subassembly (2), allotment subassembly (2) are including ratio case (21) and divide powder (22), ratio case (21) overlap joint in the top of dividing powder (22) and the upper segment of dividing powder (22) extends to in ratio case (21).

2. The automatic powder mixing device for the laser melting deposition forming of the gradient material structure according to claim 1, wherein: the powder supply assembly (1) comprises a first supply tank (11), a second supply tank (12) and a conveying pipeline (13), the first supply tank (11) and the second supply tank (12) are arranged at intervals, discharge pipes (14) are arranged at the bottoms of the first supply tank (11) and the second supply tank (12), blocking disks (141) are horizontally arranged in the two discharge pipes (14), each blocking disk (141) is provided with a blocking motor (142) and a rotating shaft (143) at the side, the blocking motors (142) are arranged on the outer side wall of the corresponding discharge pipe (14), the rotating shafts (143) are rotatably arranged on the discharge pipes (14), the blocking disks (141) are fixedly connected with the rotating shafts (143), the rotating shafts (143) are fixedly connected with output shafts of the blocking motors (142), the section of the conveying pipeline (13) is Y-shaped, the upper section of the conveying pipeline (13) is connected with the two discharge pipes (14), the lower section of the conveying pipeline (13) extends into the proportioning box (21).

3. The automatic powder mixing device for the laser melting deposition forming of the gradient material structure according to claim 2, wherein: the side of pipeline (13) is equipped with rather than fixed connection's support frame (131), be equipped with in the hypomere of pipeline (13) and break up motor (132) and break up piece (133), break up motor (132) and install in pipeline (13) and break up piece (133) and install on the output shaft of breaking up motor (132), the top of breaking up motor (132) is equipped with dispersion board (134) and breaks up motor (132) fixed connection, dispersion board (134) are the toper.

4. The automatic powder mixing device for the laser melting deposition forming of the gradient material structure according to claim 1, wherein: the top of ratio case (21) is equipped with into powder hole (211) and the bottom of ratio case (21) is equipped with four support columns (212) and four support columns (212) are the matrix arrangement, and the below of every support column (212) is equipped with weighing device (213), the cross-section of ratio case (21) is hourglass hopper-shaped.

5. The automatic powder mixing device for the laser melting deposition forming of the gradient material structure according to claim 1, wherein: the powder distributing part (22) comprises a distributing block (221), a pushing rod (222), an accommodating block (223) and a distributing shell (224), the distributing shell (224) is fixedly connected with the bottom of the proportioning box (21), two material passing channels (225) are arranged in the distributing shell (224), the accommodating block (223) is installed on the distributing shell (224), the pushing rod (222) is inserted in the accommodating block (223), a guide rod (226) in sliding fit with the accommodating block (223) is arranged beside the pushing rod (222), a pushing motor (227) and a pushing gear (228) are arranged in the accommodating block (223), the pushing gear (228) is installed on an output shaft of the pushing motor (227), a tooth groove meshed with the pushing gear (228) is formed in the pushing rod (222), the section of the distributing block (221) is triangular, and the distributing block (221) is installed on the tops of the pushing rod (222) and the guide rod (226), powder blocking blocks (229) are arranged on two sides of the distributing block (221), the tops of the two powder blocking blocks (229) extend into the distributing shell (224), abutting springs (2210) are arranged at the bottoms of the two powder blocking blocks (229), and the bottoms of all the abutting springs (2210) are fixedly connected with the top of the accommodating block (223).

6. The automatic powder mixing device for the laser melting deposition forming of the gradient material structure according to claim 5, wherein: the powder feeding device is characterized in that a powder pumping pump (23) and a powder pumping pipeline (24) are arranged beside the powder distributing shell (224), one end of the powder pumping pipeline (24) is in plug fit with the input end of the powder pumping pump (23), the other end of the powder pumping pipeline (24) penetrates through the side wall of the powder distributing shell (224) to be communicated with the inner space of the powder distributing shell (224), and the powder feeder (5) is communicated with the output end of the powder pumping pump (23).

7. The automatic powder mixing device for the laser melting deposition forming of the gradient material structure according to claim 5, wherein: the recovery assembly (3) comprises a recovery duct (31) and two closing plates (32), the top of the vertical setting of recovery pipeline (31) and recovery pipeline (31) extends to and divides in material shell (224), and the bottom of recovery pipeline (31) is equipped with bed hedgehopping piece (33), two closing plate (32) symmetry sets up and two closing plate (32) all are located recovery pipeline (31), and the up end of two closing plate (32) sets up with the up end coplanar of recovery pipeline (31), and two closing plate (32) are articulated with recovery pipeline (31), and the bottom of two closing plate (32) all is equipped with push pedal (34) that the slope set up, and outside the hypomere of two push pedal (34) all extended to the lateral wall of recovery pipeline (31), the both sides of recovery pipeline (31) were equipped with push cylinder (35) and the output of two push cylinder (35) respectively with two push pedal (34) fixed connection.

8. The automatic powder mixing device for the laser melting deposition forming of the gradient material structure according to claim 7, wherein: be equipped with rather than grafting complex collection box (331) in bed hedgehopping piece (33), be equipped with the handle on collection box (331), be equipped with operation pump (332) on bed hedgehopping piece (33), the input of operation pump (332) is equipped with inhales pipeline (333), inhale pipeline (333) cross-section and be the L type and inhale the one end of pipeline (333) and extend to in recovery pipeline (31), inhale the other end of pipeline (333) and the input intercommunication of operation pump (332), the output of operation pump (332) is equipped with output pipeline (334), in the one end of output pipeline (334) extends to recovery pipeline (31), the other end of output pipeline (334) and the output intercommunication of operation pump (332).

Technical Field

The invention relates to the technical field of 3D printing, in particular to an automatic powder mixing device for laser melting deposition forming of a gradient material structure.

Background

In order to improve the system efficiency, the new generation of space equipment gradually develops towards light weight, integration and structure-function integration, wherein a gradient material structure is a typical representative of structure-function integration, chemical components of the gradient material structure change layer by layer, multiple requirements of functions such as strength, corrosion resistance, heat resistance, light weight and the like can be met simultaneously, the gradient material structure has wide application prospect, the traditional manufacturing method cannot realize the forming of the gradient material structure, but because the preparation of the gradient material structure needs two kinds of powder, and the proportion of the two changes layer by layer, the step of powder blending, powder filling and forming needs to be carried out again after each layer of deposition, and patent No. CN201810047023.6 is cited, a device for preparing the functional gradient material by selective laser melting comprises a forming chamber, a box body, a cabin door, a handle, a PLC (programmable logic controller), a light path channel and a working platform, The powder collecting device comprises a boss, a lower guide rail, a lower sliding block, a lower connecting block, an upper guide rail, an upper sliding block, an upper connecting block, a scraper supporting column I, a scraper supporting column II, a scraper II, a powder dropping pipeline, a powder collecting box, a micro vibrating motor, a screen, a handle I, a powder collecting box, a handle II, a chute, a partition plate, a heating chamber, a heating rod, a powder sieving chamber, a forming cylinder, a piston, a powder feeding cylinder I, a powder feeding bottom plate I, a powder feeding cylinder II, a forming base plate, a powder outlet I, a powder dropping outlet I, a movable baffle I, an electric push rod I, a movable baffle II, a powder dropping outlet II, a powder outlet II, a limiting block I, a limiting block II, a piston I, a piston II and an electric; the invention adopts the underneath type powder feeding to save materials, and the integrated design of powder forming, sieving, drying and recovery simplifies the working procedures and saves the time.

Although the device can provide two powder cylinders for powder supply, the problem of automatic layer-by-layer powder blending, mixing and feeding in the laser melting deposition forming process still cannot be solved.

Disclosure of Invention

The invention aims to provide an automatic powder mixing device for laser melting deposition forming of a gradient material structure, which aims to solve the technical problem of automatic layer-by-layer blending, mixing and feeding of powder in the laser melting deposition forming process in the prior art.

The invention provides an automatic powder mixing device for laser melting deposition forming of a gradient material structure, which comprises a powder feeder, a powder feeding head, a powder supplying assembly, a blending assembly and a recycling assembly, wherein the powder supplying assembly is arranged at the top of the blending assembly, one end of the powder supplying assembly extends into the blending assembly, the blending assembly is arranged at the top of the recycling assembly, the powder feeding head is arranged at one end of the powder feeder, the other end of the powder feeder extends to the lower section of the blending assembly, the blending assembly comprises a proportioning box and a powder distributing member, the proportioning box is lapped at the top of the powder distributing member, and the upper section of the powder distributing member extends into the proportioning box.

Further, supply the powder subassembly to include first feed jar, second feed jar and pipeline, first feed jar and second feed jar interval set up and the bottom of first feed jar and second feed jar all is equipped with the discharging pipe, and equal level is provided with in two discharging pipes blocks the disc, every block the disc side and all be equipped with and block motor and rotation axis, block that the motor is installed on the lateral wall that corresponds the discharging pipe and the rotation axis can the pivoted install on the discharging pipe, block disc and rotation axis fixed connection and rotation axis and the output shaft fixed connection who blocks the motor, the pipeline cross-section is Y shape and pipeline's upper segment and is connected with two discharging pipes, and pipeline's hypomere extends to the ratio incasement.

Further, pipeline's side is equipped with rather than fixed connection's support frame, be equipped with in pipeline's the hypomere and break up the motor and break up the piece, break up the motor and install in pipeline and break up the piece and install on the output shaft of breaking up the motor, the top of breaking up the motor is equipped with dispersion board and breaks up motor fixed connection, the dispersion board is the toper.

Furthermore, the top of ratio case is equipped with into whitewashed hole and the bottom of ratio case is equipped with four support columns and four support columns are the matrix arrangement, and the below of every support column is equipped with the weighing ware, the cross-section of ratio case is hourglass hopper-shaped.

Furthermore, the powder distributing piece comprises a material distributing block, a pushing rod, a containing block and a material distributing shell, the material distributing shell is fixedly connected with the bottom of the proportioning box, two material passing channels are arranged in the material distributing shell, the containing block is arranged on the material distributing shell, the pushing rod is inserted in the containing block, the side of the pushing rod is provided with a guide rod which is in sliding fit with the containing block, a pushing motor and a pushing gear are arranged in the containing block, the pushing gear is arranged on an output shaft of the pushing motor, a tooth groove meshed with the pushing gear is arranged on the pushing rod, the distributor block cross-section is triangle-shaped and the distributor block is installed in the top of propelling movement pole and guide bar, the both sides of distributor block all are equipped with and keep off the powder piece, and the top that two keep off the powder piece extends to in dividing the material shell and the bottom that two kept off the powder piece all is equipped with conflict spring, all conflict spring's bottom all with hold a top fixed connection.

Furthermore, a powder pumping pump and a powder pumping pipeline are arranged beside the material distribution shell, one end of the powder pumping pipeline is in plug fit with the input end of the powder pumping pump, the other end of the powder pumping pipeline penetrates through the side wall of the material distribution shell to be communicated with the inner space of the material distribution shell, and the powder feeder is communicated with the output end of the powder pumping pump.

Further, retrieve the subassembly and include recovery pipeline and two closing plates, in the vertical setting of recovery pipeline and recovery pipeline's top extended to dividing the material shell, recovery pipeline's bottom was equipped with bed hedgehopping piece, two the closing plate symmetry sets up and two closing plates all are located recovery pipeline, and the up end of two closing plates and recovery pipeline's up end coplanar set up, and two closing plates are articulated with recovery pipeline, and the bottom of two closing plates all is equipped with the push plate that the slope set up, and outside the hypomere of two push plates all extended to recovery pipeline's lateral wall, the both sides of recovery pipeline were equipped with push cylinder and two push cylinder's output respectively with two push plate fixed connection.

Further, be equipped with rather than grafting complex collection box in the bed hedgehopping piece, be equipped with the handle on the collection box, be equipped with the operation pump on the bed hedgehopping piece, the input of operation pump is equipped with the suction line, the suction line cross-section is in the L type and the one end of suction line extends to the collection pipe in, the other end of suction line and the input intercommunication of operation pump, the output of operation pump is equipped with the output pipeline, in the one end of output pipeline extends to the collection pipe, the other end of output pipeline and the output intercommunication of operation pump.

Compared with the prior art, the invention has the beneficial effects that:

two different powders are respectively placed in a first feeding tank and a second feeding tank.

One of them, when the powder when needing the ratio, block the motor drive rotation axis and make the break-make that blocks first feed jar of disc rotation control and second feed jar, thereby it is intraductal to make the powder of difference in first feed jar and the second feed jar get into Y type in proper order, and pile up the formation level in the ratio incasement through Y type pipe successive layer, the powder through blocking in the rotation control first feed jar of disc or the second feed jar gets into the intraductal volume of Y type, thereby avoid different powder quantity ratio errors to lead to the product quality and the intensity of sintering to reach the standard.

Secondly, when forming different kind of powder of level and need using, hold the vertical downstream of propelling movement motor drive propelling movement gear messenger propelling movement pole in the piece, the propelling movement pole drives the branch material piece downstream and makes the powder of the bottom one deck in the ratio case pass through two material channels and get into and divide the material shell, air-extracting pump work is carried the powder in dividing the material shell to the powder feeder in and is outwards discharged through sending the powder head through taking out the powder pipeline, thereby when having avoided absorbing the powder all the time the top absorption leads to the powder to absorbing a period of time back in the ratio incasement, the powder bed of material descends and needs constantly to adjust the suction that absorbs the powder, the efficiency of absorbing the powder has been improved.

Third, get into in the pipeline single powder directly through pipeline get into the ratio incasement, if the powder that gets into in the pipeline is when multiple powder, break up motor drive and break up the piece and rotate, break up the piece and break up multiple powder in to getting into pipeline and make the powder mix together, set up and break up the motor in pipeline and improved multiple powder and mix together with breaking up the piece to avoid multiple powder still to be one deck pile up the one deck and not mix together when needs mix.

The utility model discloses a material recovery device, including the setting, the setting is used for retrieving the powder after the deposit is accomplished, and when the powder needs to be retrieved, two propelling movement cylinders drive two propelling movement boards and make two propelling movement board rotatory, divide the powder in the material shell to pass through in the recovery box that recovery pipeline got into in the block of bed hedgehopping, the operation pump that sets up was used for accelerating the speed that the powder in the material shell got into in the recovery box to improve production efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a partial perspective view of the first embodiment of the present invention;

FIG. 3 is a schematic perspective view of a powder supply assembly according to the present invention;

FIG. 4 is an enlarged view of the portion A in FIG. 3;

FIG. 5 is a partial perspective view of the second embodiment of the present invention;

FIG. 6 is a partial cross-sectional view of the present invention;

FIG. 7 is a cross-sectional view of the powder distributing member of the present invention;

FIG. 8 is a cross-sectional view of the proportioning box of the present invention;

FIG. 9 is a partial cross-sectional view of the powder distributing member of the present invention;

FIG. 10 is a partial cross-sectional view of the dispensing shell of the present invention;

fig. 11 is a schematic perspective view of the recycling assembly of the present invention.

Reference numerals: the powder feeding assembly 1, the first feeding tank 11, the second feeding tank 12, the conveying pipeline 13, the supporting frame 131, the scattering motor 132, the scattering block 133, the dispersing plate 134, the discharging pipe 14, the blocking disk 141, the blocking motor 142, the rotating shaft 143, the blending assembly 2, the proportioning tank 21, the powder feeding hole 211, the supporting column 212, the weighing device 213, the powder distributing part 22, the powder distributing block 221, the pushing rod 222, the accommodating block 223, the powder distributing shell 224, the material passing channel 225, the guiding rod 226, the pushing motor 227, the pushing gear 228, the powder blocking block 229, the abutting spring, the powder pumping pump 23, the powder pumping pipeline 24, the recovery assembly 3, the recovery pipeline 31, the closing plate 32, the block 2210, the recovery tank 331, the operation pump 332, the suction pipeline 333, the output pipeline 334, the pushing plate 34, the pushing cylinder 35, the powder feeding head 4 and the powder feeder 5.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 11, an embodiment of the present invention provides an automatic powder mixing device for laser melting deposition forming of a gradient material structure, including a powder feeder 5 and a powder feeding head 4, and further including a powder supply component 1, a blending component 2 and a recovery component 3, where the powder supply component 1 is installed at the top of the blending component 2, one end of the powder supply component 1 extends into the blending component 2, the blending component 2 is installed at the top of the recovery component 3, the powder feeding head 4 is installed at one end of the powder feeder 5, and the other end of the powder feeder 5 extends to the lower section of the blending component 2, the blending component 2 includes a proportioning box 21 and a powder distributing component 22, and the proportioning box 21 is lapped on the top of the powder distributing component 22, and the upper section of the powder distributing component 22 extends into the proportioning box 21.

Specifically, the powder supply assembly 1 includes a first supply tank 11, a second supply tank 12 and a conveying pipeline 13, the first supply tank 11 and the second supply tank 12 are arranged at intervals, discharge pipes 14 are respectively arranged at the bottoms of the first supply tank 11 and the second supply tank 12, blocking disks 141 are horizontally arranged in the two discharge pipes 14, a blocking motor 142 and a rotating shaft 143 are respectively arranged at the side of each blocking disk 141, the blocking motor 142 is mounted on the outer side wall of the corresponding discharge pipe 14, the rotating shaft 143 is rotatably mounted on the discharge pipe 14, the blocking disks 141 are fixedly connected with the rotating shaft 143, the rotating shaft 143 is fixedly connected with an output shaft of the blocking motor 142, the conveying pipeline 13 is Y-shaped in cross section, the upper section of the conveying pipeline 13 is connected with the two discharge pipes 14, the lower section of the conveying pipeline 13 extends into the proportioning box 21, the first supply tank 11 and the second supply tank 12 are arranged to accommodate two different powder materials, when powder when needing the ratio, block motor 142 drive rotation axis 143 and make and block the first feed jar 11 of the rotatory control of disc 141 and the break-make of second feed jar 12, thereby make different powder in first feed jar 11 and the second feed jar 12 get into in the Y type pipe in proper order, and pile up the formation level in ratio case 21 through Y type pipe successive layer, the powder through blocking disc 141 rotation control in first feed jar 11 or the second feed jar 12 gets into the intraductal volume of Y type, thereby avoid different powder quantity ratio mistakes to lead to the product quality and the intensity of sintering to reach the standard.

Specifically, a supporting frame 131 fixedly connected with the conveying pipeline 13 is arranged beside the conveying pipeline 13, a scattering motor 132 and a scattering block 133 are arranged in the lower section of the conveying pipeline 13, the scattering motor 132 is installed in the conveying pipeline 13, the scattering block 133 is installed on an output shaft of the scattering motor 132, a dispersion plate 134 is arranged at the top of the scattering motor 132, the dispersion plate 134 is fixedly connected with the scattering motor 132, the dispersion plate 134 is conical, the supporting frame 131 is used for supporting and bearing the conveying pipeline 13, the first feeding tank 11 and the second feeding tank 12, when a single powder entering the conveying pipeline 13 directly enters the proportioning tank 21 through the conveying pipeline 13, if the powder entering the conveying pipeline 13 is a plurality of powders, the scattering motor 132 drives the scattering block 133 to rotate, and the scattering block 133 scatters the plurality of powders entering the conveying pipeline 13 to mix the powders together, the arrangement of the scattering motor 132 and the scattering block 133 in the conveying pipeline 13 improves the mixing of various powders, so as to prevent the various powders from still being stacked one on another and not being mixed together when the powders are required to be mixed, and the arranged dispersion plate 134 is used for guiding the materials entering the conveying pipeline 13 so as to prevent the powders from being accumulated on the scattering motor 132.

Specifically, the top of the proportioning box 21 is provided with a powder inlet 211, the bottom of the proportioning box 21 is provided with four supporting columns 212, the four supporting columns 212 are arranged in a matrix, a weighing device 213 is arranged below each supporting column 212, the section of the proportioning box 21 is funnel-shaped, the funnel-shaped proportioning box 21 can enable powder to be gathered below the proportioning box 21 so as to be distributed into the powder distributing part 22, the four supporting columns 212 are used for supporting the proportioning box 21, the weighing device 213 below each supporting column 212 is used for weighing the powder in the proportioning box 21, the two kinds of powder are simultaneously conveyed into the proportioning box 21, and when the weight of the powder in the proportioning box 21 reaches the weight required by a layer to be deposited, the blocking disc 141 prevents the first feeding tank 11 and the second feeding tank 12 from continuously feeding the proportioning box 21.

Specifically, the powder distributing part 22 includes a distributing block 221, a pushing rod 222, an accommodating block 223 and a distributing shell 224, the distributing shell 224 is fixedly connected to the bottom of the proportioning box 21, two material passing channels 225 are arranged in the distributing shell 224, the accommodating block 223 is mounted on the distributing shell 224, the pushing rod 222 is inserted in the accommodating block 223, a guide rod 226 in sliding fit with the accommodating block 223 is arranged beside the pushing rod 222, a pushing motor 227 and a pushing gear 228 are arranged in the accommodating block 223, the pushing gear 228 is mounted on an output shaft of the pushing motor 227, tooth grooves meshed with the pushing gear 228 are arranged on the pushing rod 222, the distributing block 221 has a triangular cross section, the distributing block 221 is mounted on the tops of the pushing rod 222 and the guide rod 226, powder blocking blocks 229 are arranged on both sides of the distributing block 221, the tops of the two powder blocking blocks 229 extend into the distributing shell 224, and interference springs are arranged at the bottoms of the two powder blocking blocks 229, the bottoms of all the interference springs 2210 are fixedly connected to the top of the accommodating block 223, two powder baffles are provided to prevent the separated material in the material separating shell 224 from the material separating shell 224 to diffuse out of the proportioning box 21, and the interference springs 2210 always provide an interference force to prevent the two powder baffles from being separated from the material separating shell 224.

Specifically, a powder pumping pump 23 and a powder pumping pipeline 24 are arranged beside the distributing shell 224, one end of the powder pumping pipeline 24 is in insertion fit with an input end of the powder pumping pump 23, the other end of the powder pumping pipeline 24 penetrates through the side wall of the distributing shell 224 to be communicated with the inner space of the distributing shell 224, the powder feeder 5 is communicated with an output end of the powder pumping pump 23, when different types of powder in different layers need to be used, a pushing motor 227 in a containing block 223 drives a pushing gear 228 to enable a pushing rod 222 to vertically move downwards, the pushing rod 222 drives a distributing block 221 to move downwards so that the powder in the lowest layer in the proportioning box 21 enters the distributing shell 224 through two material passing channels 225, the air pumping pump works to convey the powder in the distributing shell 224 into the powder feeder 5 through the powder pumping pipeline 24 and discharge the powder outwards through a powder feeding head 4, and therefore the situation that the powder is sucked at the highest end in the proportioning box 21 for a period of time all the time when the powder is sucked is avoided, the powder layer is decreased, the suction force for absorbing the powder needs to be continuously adjusted, and the powder absorbing efficiency is improved.

Specifically, the recycling assembly 3 includes a recycling pipeline 31 and two closing plates 32, the recycling pipeline 31 is vertically arranged, the top of the recycling pipeline 31 extends into the material distribution shell 224, the bottom of the recycling pipeline 31 is provided with an elevating block 33, the two closing plates 32 are symmetrically arranged, the two closing plates 32 are located in the recycling pipeline 31, the upper end surfaces of the two closing plates 32 and the upper end surface of the recycling pipeline 31 are arranged in a coplanar manner, the two closing plates 32 are hinged to the recycling pipeline 31, the bottoms of the two closing plates 32 are provided with obliquely arranged pushing plates 34, the lower sections of the two pushing plates 34 extend out of the side wall of the recycling pipeline 31, two sides of the recycling pipeline 31 are provided with pushing cylinders 35, the output ends of the two pushing cylinders 35 are respectively fixedly connected with the two pushing plates 34, when powder needs to be recycled, the two pushing cylinders 35 drive the two pushing plates 34 to rotate the two pushing plates 34, the powder in the material distributing shell 224 enters the recovery pipeline 31, and the two pushing plates 34 are arranged to close the recovery pipeline 31, and when the two pushing plates 34 move, the pushing plates 34 can be driven to rotate so as to control the on-off of the recovery pipeline 31.

Specifically, a recovery box 331 is arranged in the block 33, the recovery box 331 is in plug-in fit with the block 33, a handle is arranged on the recovery box 331, an operation pump 332 is arranged on the block 33, an intake pipeline 333 is arranged at an input end of the operation pump 332, a cross section of the intake pipeline 333 is L-shaped, one end of the intake pipeline 333 extends into the recovery pipeline 31, the other end of the intake pipeline 333 is communicated with an input end of the operation pump 332, an output pipeline 334 is arranged at an output end of the operation pump 332, one end of the output pipeline 334 extends into the recovery pipeline 31, the other end of the output pipeline 334 is communicated with an output end of the operation pump 332, and the operation pump 332 is arranged to accelerate the speed of the powder in the material distributing shell 224 entering the recovery box 331, so that the production efficiency is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.