Powder ultrasonic selective separation 3D printing device and printing method

Abstract

The invention relates to the field of 3D printing, in particular to a powder ultrasonic selective separation 3D printing device and method. A powder ultrasonic selective separation 3D printing device comprises a rack, a printing platform is arranged on the rack, and a powder laying area and a printing area are arranged on the printing platform; a notch is formed in the rear side wall of a spray head of the ultrasonic spray nozzle, the ultrasonic spray nozzle is arranged above the printing platform and fixedly connected with the rack through a three-axis driving mechanism, and the three-axis driving mechanism drives the ultrasonic spray nozzle to move in the X-axis direction, the Y-axis direction and the Z-axis direction; the rotary driving mechanism is in transmission connection with the ultrasonic nozzle and is used for driving the ultrasonic nozzle to rotate; a powder spreading roller; and the driving mechanism is used for driving the powder spreading roller to move back and forth in the powder spreading area and the printing area. The 3D printing device has the advantages of being high in 3D printing efficiency, convenient to operate, simple in structure, high in practicability and the like.

Description

Technical Field

[0001] The invention relates to the field of 3D printing, and is a powder ultrasonic selective separation 3D printing device and a printing method. Background Art

[0002] With the rapid development of aerospace, automotive industry and people's demand for printing a variety of powder materials, powder 3D printing technology has been widely used in manufacturing, construction, medical field, education and research, as well as art and design in recent years, realizing the production and customization of complex parts through the fluidity and filling properties of powder.

[0003] Existing powder 3D printing technology has difficulty printing complex materials. Additional support structures need to be added when printing complex materials, which increases printing costs and time. In addition, post-processing of powder 3D printing, such as support removal and surface polishing, is often complex and time-consuming. Summary of the invention

[0004] The object of the present invention is to provide a powder ultrasonic selective separation 3D printing device and a printing method.

[0005] To achieve the above object, the present invention provides a powder ultrasonic selective separation 3D printing device, comprising:

[0006] A frame, wherein a printing platform is provided on the frame, and a powder spreading area and a printing area are provided on the printing platform;

[0007] An ultrasonic nozzle, wherein a notch is provided on the rear side wall of the nozzle of the ultrasonic nozzle, the ultrasonic nozzle is arranged above the printing platform, and is connected and fixed to the frame through a three-axis driving mechanism, and the three-axis driving mechanism drives the ultrasonic nozzle to move along the X-axis, Y-axis and Z-axis directions;

[0008] A rotary drive mechanism, the rotary drive mechanism is drivingly connected to the ultrasonic nozzle and is used to drive the ultrasonic nozzle to rotate;

[0009] A powder spreading roller, the powder spreading roller being horizontally arranged above the printing platform;

[0010] A driving mechanism is fixedly connected to the frame, and a driving end thereof is drivingly connected to the powder spreading roller, and the driving mechanism is used to drive the powder spreading roller to move back and forth between the powder spreading area and the printing area.

[0011] Furthermore, the three-axis driving mechanism includes an X-axis driving unit, a Y-axis driving unit and a Z-axis driving unit, wherein two Y-axis driving units are provided and distributed on both sides of the printing platform, the driving ends of the two Y-axis driving units are connected by a connecting frame, the X-axis driving unit is arranged on the connecting frame, the Z-axis driving unit is installed on the driving end of the X-axis driving unit, and the ultrasonic nozzle is connected and fixed to the driving end of the Z-axis driving unit.

[0012] Furthermore, a ceramic sheet is provided at the upper end of the ultrasonic nozzle.

[0013] Furthermore, the rotary drive mechanism includes a drive frame, a first motor, a gear shaft and a toothed disc. The drive frame is connected and fixed to the drive end of the Z-axis drive unit. The first motor is fixed on the drive frame, and its drive shaft is set downward; the gear shaft is coaxially fixed on the drive shaft of the first motor, and the toothed disc is rotatably installed on the drive frame, and its external gear is meshed with the gear shaft. The ultrasonic nozzle is coaxially fixed in the toothed disc, and its lower end passes through the drive frame, and its upper end is externally connected to a threaded hose.

[0014] Furthermore, the driving mechanism comprises:

[0015] Two guide rails are provided; the two guide rails are respectively arranged horizontally on both sides of the printing platform and are fixedly connected to the frame;

[0016] a second motor, wherein the second motor is fixed on the frame;

[0017] There are two conveyor belts; the two conveyor belts are arranged corresponding to the two guide rails, the second motor is connected to one of the conveyor belts by transmission, and the two conveyor belts are connected by transmission shaft;

[0018] There are two belt pressure plates; the two belt pressure plates are arranged corresponding to the two guide rails and the two conveyor belts, and the belt pressure plates are slidably connected to the guide rails and fixedly connected to the conveyor belts.

[0019] Furthermore, a lifting platform is provided at the upper end of the belt pressure plate, and the powder spreading roller is connected and fixed to the lifting platform.

[0020] Furthermore, one end of the powder spreading roller is transmission connected to a third motor.

[0021] Furthermore, the powder spreading area is provided with a powder supply base plate, and a powder supply cylinder with an open lower end is provided below the powder spreading area. The powder supply base plate is located in the powder supply cylinder, and its side wall is slidably connected to the inner wall of the powder supply cylinder. A first lifting unit is provided at the bottom of the powder supply base plate, and the first lifting unit drives the powder supply base plate to move up and down along the inner wall of the powder supply cylinder.

[0022] Furthermore, the molding area is provided with a molding base plate, and a molding cylinder with an open lower end is provided below the molding area. The molding base plate is located in the molding cylinder, and its side wall is slidably connected to the inner wall of the molding cylinder. A second lifting unit is provided at the bottom of the molding base plate, and the second lifting unit drives the molding base plate to move up and down along the inner wall of the molding cylinder.

[0023] A powder ultrasonic selective separation 3D printing method is implemented using the above 3D printing device, and specifically comprises the following steps:

[0024] (1) Powder filling step: feeding the forming powder into the powder spreading area and pouring the isolation powder into the ultrasonic nozzle;

[0025] (2) Set printing parameters;

[0026] (3) Printing step: The powder roller spreads the forming powder to the forming area, the ultrasonic nozzle moves to the top of the forming area, and the nozzle is inserted into the forming powder to start the 3D printing process until the printed product is completed;

[0027] (4) Post-processing sintering step: The printed product is moved to a sintering furnace for sintering. The sintering temperature of the isolation powder is higher than that of the forming powder. After sintering, the sintered component is taken out of the sintering furnace and the isolation powder is removed to obtain the printed product.

[0028] The beneficial effects of the present invention are:

[0029] (1) The 3D printing method of the present invention does not require a support structure. By designing an isolation powder to replace the traditional support structure, the isolation powder is placed in the forming powder for printing to achieve effective support for the forming powder. At the same time, the sintering temperature of the isolation powder is higher than the sintering process conditions of the forming powder, so that after sintering, the isolation powder still exists in the form of powder, which reduces the difficulty of post-processing of the isolation powder and improves the removal efficiency.

[0030] (2) The 3D printing method of the present invention combines ultrasonic technology with powder 3D printing technology to form powder ultrasonic selective separation and sintering 3D printing technology, which can achieve a stable powder spraying speed and uniform powder output. In addition, the selective separation and sintering process of the printed parts is more conducive to printing complex structures. There is no need to provide support materials, thus avoiding damage to the parts that may be caused by support removal.

[0031] (3) The 3D printing device of the present invention has the advantages of high 3D printing efficiency, convenient operation, simple structure and strong practicality.

[0032] (4) The 3D printing method using the 3D printing device of the present invention also has good adaptability in low / microgravity environments. For example, in the aspect of in-situ resource utilization of asteroid soil additive manufacturing, the fluidity of powder materials may be significantly affected in low / microgravity environments. Traditional extrusion or injection processes are difficult to operate stably due to their reliance on gravity or pressure to drive material delivery. However, in the 3D printing device and printing method of the present invention, the nozzle is directly inserted into the powder pile to ensure a closer contact between the powder and the nozzle, avoiding the problem of powder drift or dispersion. Therefore, it is insensitive to gravity changes and is more suitable for stable operation in low / microgravity environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0034] Figure 1 It is a schematic structural diagram of a powder ultrasonic selective separation 3D printing device of the present invention;

[0035] Figure 2 It is a structural schematic diagram of the three-axis driving mechanism of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the driving mechanism of the present invention;

[0037] Figure 4 is a schematic structural diagram of the rotary drive mechanism of the present invention;

[0038] Figure 5 It is a schematic structural diagram of a powder ultrasonic selective separation 3D printing device of the present invention;

[0039] Figure 6 It is a structural schematic diagram of the ultrasonic nozzle of the present invention;

[0040] Figure 7 It is a schematic diagram of the partial structure of the ultrasonic nozzle of the present invention. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of the present invention, it should be understood that “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0043] On the one hand, see Figure 1-7The present invention provides a powder ultrasonic selective separation 3D printing device, comprising:

[0044] A frame 100, wherein a printing platform 200 is disposed on the frame 100, and a powder spreading area and a printing area are disposed on the printing platform 200;

[0045] An ultrasonic nozzle 300, wherein a notch 301 is provided on the rear side wall of the nozzle of the ultrasonic nozzle 300, and the ultrasonic nozzle 300 is disposed above the printing platform 200, and is connected and fixed to the frame 100 via a three-axis driving mechanism, and the three-axis driving mechanism drives the ultrasonic nozzle 300 to move along the X-axis, Y-axis, and Z-axis directions;

[0046] A rotation driving mechanism, the rotation driving mechanism is transmission-connected to the ultrasonic nozzle 300, and is used to drive the ultrasonic nozzle 300 to rotate;

[0047] A powder spreading roller 400, wherein the powder spreading roller 400 is horizontally arranged above the printing platform 200;

[0048] A driving mechanism is fixedly connected to the frame 100, and a driving end thereof is transmission-connected to the powder spreading roller 400, and the driving mechanism is used to drive the powder spreading roller 400 to move back and forth between the powder spreading area and the printing area.

[0049] In the present invention, in order to ensure the lightness of the equipment, the frame 100 is a frame structure composed of angle steels, and a universal wheel 101 is provided at the bottom of the frame 100 to facilitate the movement of the equipment. The printing platform 200 is used to realize 3D printing operations, the powder spreading area is used to load the forming powder material, and the printing area is used to complete the 3D printing process. After the forming powder is loaded on the powder spreading area, the driving mechanism drives the powder spreading roller 400 to move, and the forming powder in the powder spreading area is spread to the printing area. The powder spreading area and the printing area are spaced apart along the Y-axis direction, and the powder spreading roller 400 is arranged along the X-axis direction. The three-axis driving mechanism realizes the precise adjustment of the ultrasonic nozzle 300 in the three directions of the X-axis, the Y-axis and the Z-axis, thereby improving the printing accuracy and printing efficiency. The isolation powder for 3D printing enters the ultrasonic nozzle 300, and the three-axis driving mechanism drives the ultrasonic nozzle 300 to move above the printing area. The rotary driving mechanism drives the ultrasonic nozzle 300 to maintain a rotating state during the operation. When printing, the isolation powder is sprayed out from the notch 301 of the ultrasonic nozzle 300. Since the ultrasonic nozzle 300 is in a rotating state, the isolation powder is sprayed out from the rear of the nozzle, which is conducive to separating the forming material from the isolation material.

[0050] As an embodiment of the present invention, the three-axis driving mechanism includes an X-axis driving unit 500, a Y-axis driving unit 501 and a Z-axis driving unit 502, wherein the Y-axis driving unit 501 is provided with two and distributed on both sides of the printing platform 200, the driving ends of the two Y-axis driving units 501 are connected by a connecting frame, the X-axis driving unit 500 is arranged on the connecting frame, the Z-axis driving unit 502 is installed on the driving end of the X-axis driving unit 500, and the ultrasonic nozzle 300 is connected and fixed to the driving end of the Z-axis driving unit 502.

[0051] In the present invention, the X-axis driving unit 500, the Y-axis driving unit 501 and the Z-axis driving unit 502 are all linear modules, and the driving structure of the linear module has the advantages of straight driving trajectory, high driving efficiency and low implementation cost.

[0052] As an embodiment of the present invention, a ceramic sheet 302 is provided at the upper end of the ultrasonic nozzle 300 , and the ceramic sheet 302 is fixed by a rear cover 304 and a nut 303 .

[0053] In the present invention, a control line is externally connected to the ceramic sheet 302, and an ultrasonic vibrator is externally connected through the control line. The ultrasonic vibrator transmits ultrasonic vibration to the ceramic sheet 302, and finally acts on the ultrasonic nozzle 300. Under the action of ultrasonic vibration, the ultrasonic nozzle 300 can achieve precise control of the powder flow rate during powder spraying, and make the powder spray uniform.

[0054] As an embodiment of the present invention, the rotary drive mechanism includes a drive frame 600, a first motor 601, a gear shaft 602 and a toothed disc 603. The drive frame 600 is connected and fixed to the drive end of the Z-axis drive unit 502. The first motor 601 is fixed on the drive frame 600, and its drive shaft is set downward; the gear shaft 602 is coaxially fixed on the drive shaft of the first motor 601, and the toothed disc 603 is rotatably mounted on the drive frame 600, and its external gear is meshed with the gear shaft 602. The ultrasonic nozzle 300 is coaxially fixed in the toothed disc 603, its lower end passes through the drive frame 600, and its upper end is externally connected to a threaded hose 604.

[0055] In the present invention, the first motor 601 drives the gear shaft 602 to drive the toothed disc 603 to rotate, thereby realizing the rotation operation of the ultrasonic nozzle 300. Optimally, the first motor 601 is connected to the gear shaft 602 through a coupling 605, the ultrasonic nozzle 300 is coaxially fixed with the toothed disc 603 through a flange, and the isolation powder is conveyed to the ultrasonic nozzle 300 through a threaded hose 604. The ultrasonic nozzle 300 of the present invention is placed non-coaxially with the first motor 601, so that the movement of the ultrasonic nozzle 300 is more flexible, a larger range of motion and a more complex motion trajectory are achieved, and the printing requirements of complex shapes and structures can be better met, and the printing accuracy and efficiency are improved. At the same time, the load requirements for the first motor 601 can also be reduced, and the service life of the first motor 601 can be extended.

[0056] As an embodiment of the present invention, the driving mechanism includes:

[0057] Two guide rails 700 are provided; the two guide rails 700 are respectively horizontally arranged on both sides of the printing platform 200 and fixedly connected to the frame 100;

[0058] A second motor 701, wherein the second motor 701 is fixed on the frame 100;

[0059] There are two conveyor belts 702; the two conveyor belts 702 are arranged corresponding to the two guide rails 700, the second motor 701 is connected to one of the conveyor belts 702, and the two conveyor belts 702 are connected to each other through a transmission shaft;

[0060] There are two belt pressure plates 703 ; the two belt pressure plates 703 are arranged corresponding to the two guide rails 700 and the two conveyor belts 702 , and the belt pressure plates 703 are slidably connected to the guide rails 700 , and the belt pressure plates 703 are fixedly connected to the conveyor belts 702 .

[0061] In the present invention, the length direction of the guide rail 700 is arranged along the Y axis, which ensures the straightness and stability of the driving track of the driving mechanism. The driving principle of the driving mechanism of the present invention is: the second motor 701 drives the conveyor belt 702 for transmission, and under the action of the transmission shaft 706, the two conveyor belts 702 are driven to work synchronously, and then the belt pressing plate 703 and the powder spreading roller 400 are driven to reciprocate along the length direction of the guide rail 700, so as to achieve the laying of the formed powder in the powder spreading area to the printing area. The driving mechanism of the present invention has the advantages of simple structure, low implementation cost and high driving efficiency.

[0062] As another embodiment of the present invention, a lifting platform 704 is provided at the upper end of the belt pressure plate 703 , and the powder spreading roller 400 is connected and fixed to the lifting platform 704 .

[0063] In the present invention, the lifting platform 704 is a precision Z-axis manual lifting platform 704 of model LZ80-2. Under the action of the lifting platform 704, the height of the powder spreading roller 400 can be adjusted to adapt to various printing working conditions.

[0064] As another embodiment of the present invention, one end of the powder spreading roller 400 is transmission-connected to the third motor 707 .

[0065] In the present invention, the third motor 707 can make the powder spreading roller 400 rotate when spreading powder, thereby improving the powder spreading efficiency. The outer cover of the powder spreading roller 400 is provided with a protective cover 705 to improve the protective effect of the powder spreading roller 400.

[0066] As an embodiment of the present invention, the powder spreading area is provided with a powder supply base plate 800, and a powder supply cylinder 801 with an open lower end is provided below the powder spreading area. The powder supply base plate 800 is located in the powder supply cylinder 801, and its side wall is slidably connected to the inner wall of the powder supply cylinder 801. A first lifting unit is provided at the bottom of the powder supply base plate 800, and the first lifting unit drives the powder supply base plate 800 to move up and down along the inner wall of the powder supply cylinder 801.

[0067] In the present invention, the first lifting unit is fixed on the frame 100. The size of the powder supply base plate 800 is adapted to the bottom opening of the powder supply cylinder 801. On the one hand, it can be used as a loading tool for forming powder materials, and on the other hand, it is a work surface of the powder spreading area. The forming powder materials are placed in the powder supply cylinder 801. Under the action of the first lifting unit, the powder supply base plate 800 is driven to move upward to load the forming powder materials.

[0068] As an embodiment of the present invention, the molding area is provided with a molding base plate 900, and a molding cylinder 901 with an open lower end is provided below the molding area. The molding base plate 900 is located in the molding cylinder 901, and its side wall is slidably connected to the inner wall of the molding cylinder 901. A second lifting unit is provided at the bottom of the molding base plate 900, and the second lifting unit drives the molding base plate 900 to move up and down along the inner wall of the molding cylinder 901.

[0069] In the present invention, the second lifting unit is fixed on the frame 100. The size of the molding base plate 900 is adapted to the bottom opening of the molding cylinder 901, which serves as a work surface of the printing area. After printing is completed, the molding base plate 900 is driven downward by the second lifting unit to output the printed product for subsequent product sintering procedures. Preferably, the molding cylinder 901 is detachably connected to the frame 100 to facilitate the subsequent sintering process.

[0070] In the present invention, both the first lifting unit and the second lifting unit are drive structures composed of a servo motor and a ball screw, which belong to the prior art, and the present invention will not elaborate on their specific connection structure and working principle.

[0071] On the other hand, the present invention also provides a powder ultrasonic selective separation 3D printing method, which specifically comprises the following steps:

[0072] (1) Powder filling step: pouring the forming powder into the powder supply cylinder 801 and pouring the isolation powder into the ultrasonic nozzle 300;

[0073] (2) Printing parameter control steps: set the ultrasonic nozzle 300 printing speed (10s-30s per layer), printing path (circular, square and other shapes), slice layer height and other printing parameters in the upper computer slice software;

[0074] (3) Printing step: After the forming powder is loaded in the powder spreading area, the powder spreading roller 400 spreads the forming powder to the forming area, the ultrasonic nozzle 300 moves to the top of the forming area, and the nozzle is inserted into the forming powder to start the 3D printing process, specifically:

[0075] The first lifting unit drives the single slice layer height to rise, and the driving mechanism drives the powder spreading roller 400 to move along the Y-axis direction to spread the forming powder on the powder supply base plate 800 onto the forming base plate, forming a thinner layer of forming powder on the forming base plate. The three-axis driving mechanism drives the ultrasonic nozzle 300 to move to the printing position, inserts the ultrasonic nozzle 300 into the forming powder, and sprays the isolation powder on the part outer contour trajectory according to the two-dimensional slice pattern of the three-dimensional model. After the isolation powder layer is sprayed, the forming base plate drops to a certain height, and the dropped height is the set slice layer height. Repeat this step until the complete model is printed in the forming area.

[0076] Specifically, the height that the ultrasonic nozzle 300 descends in a single printing is 1 / N of the height of the printed mold, where N is greater than or equal to 2 and is a positive integer.

[0077] (4) Post-processing sintering step: Move the forming cylinder 901 to the sintering furnace for sintering. After sintering, take out the sintered component from the sintering furnace. The isolation powder remains loose, and the forming powder is sintered into a solid. Therefore, the isolation powder is removed to obtain a printed product. Since the sintering temperature of the isolation powder needs to be higher than that of the forming powder, the sintering temperature needs to be set in a range where the forming powder is sintered and the isolation powder remains loose.

[0078] The 3D printing method of the present invention inserts an ultrasonic nozzle 300 into the forming powder, sprays the isolation powder according to the slicing trajectory of the model until the model is formed, and in the sintering stage, sets the sintering temperature of the isolation powder to be higher than that of the forming powder. Therefore, after the printed model is sintered, only the forming powder will be solidified and formed, and the isolation powder will still remain in powder form, so as to facilitate post-processing of the isolation powder.

[0079] The printing method of 3D printing using the 3D printing device of the present invention also has good adaptability in low / microgravity environments. For example, in the in-situ resource utilization of space soil additive manufacturing, the fluidity of powder materials may be significantly affected in low / microgravity environments. Traditional extrusion or injection processes are difficult to operate stably due to their reliance on gravity or pressure to drive material delivery. However, in the 3D printing device and printing method of the present invention, the nozzle is directly inserted into the powder pile to ensure a closer contact between the powder and the nozzle, avoiding the problem of powder drift or dispersion. Therefore, it is insensitive to gravity changes and is more suitable for stable operation in low / microgravity environments.

[0080] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A powder ultrasonic selective separation 3D printing device, characterized in that: include: A frame, wherein a printing platform is provided on the frame, and a powder spreading area and a printing area are provided on the printing platform; An ultrasonic nozzle, wherein a notch is provided on the rear side wall of the nozzle of the ultrasonic nozzle, the ultrasonic nozzle is arranged above the printing platform, and is connected and fixed to the frame through a three-axis driving mechanism, and the three-axis driving mechanism drives the ultrasonic nozzle to move along the X-axis, Y-axis and Z-axis directions; A rotary drive mechanism, the rotary drive mechanism is drivingly connected to the ultrasonic nozzle and is used to drive the ultrasonic nozzle to rotate; A powder spreading roller, the powder spreading roller being horizontally arranged above the printing platform; A driving mechanism is fixedly connected to the frame, and a driving end thereof is drivingly connected to the powder spreading roller, and the driving mechanism is used to drive the powder spreading roller to move back and forth between the powder spreading area and the printing area.

2. A powder ultrasonic selective separation 3D printing device according to claim 1, characterized in that: The three-axis driving mechanism includes an X-axis driving unit, a Y-axis driving unit and a Z-axis driving unit, wherein two Y-axis driving units are provided and distributed on both sides of the printing platform, the driving ends of the two Y-axis driving units are connected by a connecting frame, the X-axis driving unit is arranged on the connecting frame, the Z-axis driving unit is installed on the driving end of the X-axis driving unit, and the ultrasonic nozzle is connected and fixed to the driving end of the Z-axis driving unit.

3. The powder ultrasonic selective separation 3D printing device according to claim 1, characterized in that: A ceramic sheet is arranged on the upper end of the ultrasonic nozzle.

4. The powder ultrasonic selective separation 3D printing device according to claim 1, characterized in that: The rotary drive mechanism comprises a drive frame, a first motor, a gear shaft and a toothed disc. The drive frame is connected and fixed to the drive end of the Z-axis drive unit. The first motor is fixed on the drive frame, and its drive shaft is arranged downward. The gear shaft is coaxially fixed on the drive shaft of the first motor. The toothed disc is rotatably mounted on the drive frame, and its external gear is meshed with the gear shaft. The ultrasonic nozzle is coaxially fixed in the toothed disc, and its lower end passes through the drive frame, and its upper end is externally connected to a threaded hose.

5. The powder ultrasonic selective separation 3D printing device according to claim 1, characterized in that: The driving mechanism comprises: Two guide rails are provided; the two guide rails are respectively arranged horizontally on both sides of the printing platform and fixedly connected to the frame; a second motor, wherein the second motor is fixed on the frame; There are two conveyor belts; the two conveyor belts are arranged corresponding to the two guide rails, the second motor is connected to one of the conveyor belts by transmission, and the two conveyor belts are connected by transmission shaft; There are two belt pressure plates; the two belt pressure plates are arranged corresponding to the two guide rails and the two conveyor belts, and the belt pressure plates are slidably connected to the guide rails and fixedly connected to the conveyor belts.

6. A powder ultrasonic selective separation 3D printing device according to claim 5, characterized in that: A lifting platform is provided at the upper end of the belt pressing plate, and the powder spreading roller is connected and fixed to the lifting platform.

7. The powder ultrasonic selective separation 3D printing device according to claim 5, characterized in that: One end of the powder spreading roller is drivingly connected to the third motor.

8. The powder ultrasonic selective separation 3D printing device according to claim 1, characterized in that: The powder spreading area is provided with a powder supply base plate, and a powder supply cylinder with an open lower end is provided below the powder spreading area. The powder supply base plate is located in the powder supply cylinder, and its side wall is slidably connected to the inner wall of the powder supply cylinder. A first lifting unit is provided at the bottom of the powder supply base plate, and the first lifting unit drives the powder supply base plate to move up and down along the inner wall of the powder supply cylinder.

9. The powder ultrasonic selective separation 3D printing device according to claim 1, characterized in that: The molding area is provided with a molding base plate, and a molding cylinder with an open lower end is provided below the molding area. The molding base plate is located in the molding cylinder, and its side wall is slidably connected to the inner wall of the molding cylinder. A second lifting unit is provided at the bottom of the molding base plate, and the second lifting unit drives the molding base plate to move up and down along the inner wall of the molding cylinder.

10. A powder ultrasonic selective separation 3D printing method, characterized in that: The method is completed by using the 3D printing device according to any one of claims 1 to 9, and specifically comprises the following steps: (1) Powder filling step: feeding the forming powder into the powder spreading area and pouring the isolation powder into the ultrasonic nozzle; (2) Set printing parameters; (3) Printing step: The powder roller spreads the forming powder to the forming area, the ultrasonic nozzle moves to the top of the forming area, and the nozzle is inserted into the forming powder to start the 3D printing process until the printed product is completed; (4) Post-processing sintering step: The printed product is moved to a sintering furnace for sintering. The sintering temperature of the isolation powder is higher than that of the forming powder. After sintering, the sintered component is taken out of the sintering furnace and the isolation powder is removed to obtain the printed product.

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