Selective laser sintering 3D printing device

Abstract

The selective laser sintering 3D printing device comprises a printing platform, the printing platform is provided with a containing cavity, a lifting piston plate is arranged on the inner side of the containing cavity, and the area, located above the lifting piston plate, of the containing cavity serves as a forming groove; the lifting piston plate is provided with two discharging openings, the two discharging openings are arranged side by side in the transverse direction of the lifting piston plate at the same time and staggered in the longitudinal direction of the lifting piston plate, and the two discharging openings are arranged in the longitudinal full-length direction of the lifting piston plate. The lifting piston plate is provided with two sealing pieces used for sealing the discharging opening, and the sealing pieces can move in a lifting mode. Air supply gaps are formed in the side walls of the two opposite sides of the containing cavity correspondingly and used for conveying airflow, and the air supply direction of the air supply gaps is arranged in the transverse direction of the lifting piston plate. A vibrator is arranged on the downward side of the lifting piston plate and used for vibrating the lifting piston plate and the sealing piece. According to the forming device, residual powder in the forming groove can be cleaned and recycled as much as possible from the discharging opening.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a selective laser sintering 3D printing device. Background Art

[0002] Selective laser sintering (SLS) printing technology is a 3D printing technology that uses infrared lasers to sinter powder materials at high temperatures and form three-dimensional parts in a layer-by-layer manner. It is a rapid prototyping technology.

[0003] The 3D printer has a printing platform. The material powder is spread in the molding groove on the printing platform and heated to a temperature just below the sintering point of the powder. The control system above the printing platform controls the laser beam to scan the powder layer according to the cross-sectional contour of the layer, so that the temperature of the powder rises to the melting point, sintering and bonding with the formed part below. After completing one layer, the bottom plate of the molding groove drops one layer in thickness, and the material roller spreads a layer of uniform and dense powder on it, and sintering of a new layer of cross section is carried out until the entire model is completed.

[0004] When the model is printed, it is necessary to take the model out of the molding tank, and the bottom plate of the molding tank needs to be moved upward and reset. At the same time, the remaining powder in the molding tank needs to be cleared so that the space in the molding tank is vacant for the printing and molding of the next model.

[0005] Since the bottom surface of the forming groove is relatively flat and the distribution area is wide, it is difficult to discharge the material by opening holes. If a sweeping mechanism is set near the surface of the printing platform, the powder can be swept off the surface of the printing platform; however, when a material spreading roller with a reciprocating function is set on the surface of the printing platform, the space for setting the sweeping mechanism is limited, which makes it difficult. Therefore, how to clean the remaining powder in the selective laser sintering printing technology is a big problem. Summary of the invention

[0006] In order to solve the problem of discharging residual powder in selective laser sintering printing, the present application provides a selective laser sintering 3D printing device.

[0007] The selective laser sintering 3D printing device provided in this application adopts the following technical solution: A selective laser sintering 3D printing device comprises a printing platform, wherein the printing platform is provided with a accommodating cavity, a lifting piston plate is provided on the inner side of the accommodating cavity, and the area of ​​the accommodating cavity above the lifting piston plate serves as a molding groove; the lifting piston plate is provided with two discharge ports, the two discharge ports are arranged side by side along the transverse direction of the lifting piston plate at the same time, and are staggered along the longitudinal direction of the lifting piston plate, and the two discharge ports are arranged along the entire longitudinal length of the lifting piston plate; the lifting piston plate is provided with two closing members for closing the discharge ports, and the closing members can be lifted and moved; the side walls on two opposite sides of the accommodating cavity are respectively provided with air supply slits, the air supply slits are used to convey airflow, and the air supply direction of the air supply slits is arranged along the transverse direction of the lifting piston plate; a vibrator is provided on the downward side of the lifting piston plate, and the vibrator is used to vibrate the lifting piston plate and the closing member.

[0008] By adopting the above technical solution, when the 3D printing device completes a printing work, the finished product is taken out from the molding tank; then the two closing parts are moved vertically away from the corresponding discharge ports, so that the powder in the molding tank is discharged from the two discharge ports. In this process, the vibrator vibrates the lifting piston plate and the closing part to speed up the discharge process of the powder. When the powder remaining on the lifting piston plate is difficult to continue to fall from the discharge port, the two air supply gaps are used to convey the airflow, so that the two air supply gaps blow the powder on the lifting piston plate in opposite directions, so that the powder on the lifting piston plate gradually falls outward from the two discharge ports. Since the two discharge ports are arranged along the entire longitudinal length of the lifting piston plate, when the two air supply gaps supply air horizontally along the lifting piston plate, the powder on the lifting piston plate can be discharged as completely as possible through the two discharge ports. The powder discharged from the molding tank can be screened and recycled to reduce resource waste.

[0009] Optionally, the longitudinal cross-section of the discharge port is trapezoidal, the longitudinal dimension of the discharge port along the lifting piston plate gradually decreases from top to bottom, the inner wall of one side of the discharge port is an upwardly inclined slope, and the slopes of the two discharge ports are inclined relative to each other.

[0010] By adopting the above technical solution, the size of the discharge port along the longitudinal direction of the lifting plate decreases from top to bottom, which can reduce the actual drop range of the discharge port. In addition, since the inclined surfaces of the two discharge ports are inclined relative to each other, the positions of the lower openings of the two discharge ports can be closer, making it easier to collect the powder dropped from the two discharge ports.

[0011] Optionally, the vibrator is a direct vibrator, which can vibrate the sealing member and the lifting piston plate in a lateral direction.

[0012] By adopting the above technical solution, the closure member and the lifting piston plate are vibrated laterally by a straight vibrator, so that the powder on the closure member can fall onto the lifting piston plate, and at the same time, the powder retained on the inclined surface of the discharge port can be gradually discharged from the lower opening of the discharge port.

[0013] Optionally, it also includes a material guiding channel and a material storage container, wherein the material guiding channel is used to guide the remaining material falling from the discharge port into the material storage container.

[0014] By adopting the above technical solution, the powder discharged from the forming groove falls into the material storage container through the material guide channel and is collected by the material storage container.

[0015] Optionally, a plurality of buffer guide plates are provided in the material guide channel, one side of the buffer guide plate is fixedly connected to the inner wall of the material guide channel, and a material guide gap is formed between the other side and the inner wall of the material guide channel, and the buffer guide plate gradually tilts downward from the fixed side toward the direction close to the material guide gap; the buffer guide plate includes a first buffer plate and a second buffer plate, and the first buffer plate and the second buffer plate are alternately arranged in sequence from top to bottom, and the first buffer plate and the second buffer plate are respectively installed on the inner walls on opposite sides of the material guide channel.

[0016] By adopting the above technical solution, after the powder enters the material guide channel from the discharge port, it passes through the first buffer plate and the second buffer plate alternately in sequence and then falls into the material storage container. By providing the buffer material guide plate, the powder can mainly slide through the material guide channel, and the distance of the powder passing through the material guide channel can be greatly extended, which is conducive to reducing the dust raised when the powder falls into the material storage container.

[0017] Optionally, the width of the air supply gap gradually increases from the outside to the inside.

[0018] By adopting the above technical solution, the width of the air supply gap gradually increases from the outside to the inside, which can reduce the situation where the air supply gap is blocked by powder.

[0019] Optionally, it also includes an air supply member, the outlet end of the air supply member is connected to the air supply gap through a pipeline, the inlet end of the air supply member is connected to the material guiding channel, and the inlet end of the air supply member is provided with a filter.

[0020] By adopting the above technical solution, the air supply element sucks the air in the material guide channel through the filter element, and then blows it into the forming tank in the form of positive pressure airflow through the pipeline, so that negative pressure is formed in the material guide channel, and a pressure difference is formed on the upper and lower sides of the discharge port, so that the floating dust in the forming tank enters the material guide channel under the action of the pressure difference. The forming tank, the material guide channel and the air supply element form a circulating airflow path, which can effectively reduce the floating dust stirred up during the powder discharge process.

[0021] Optionally, a lifting drive is provided on the downward side of the lifting piston plate, and the lifting drive is used to drive the closing member to move up and down; vertical rods are provided on the lower surfaces of the two closing members, and a connecting rod is commonly connected between the vertical rods of the two closing members, and the connecting rod is located below the lifting piston plate, and the lifting drive is connected to the connecting rod.

[0022] By adopting the above technical solution, the lifting drive member can drive two closing members simultaneously through the connecting rod and the two vertical rods, which is conducive to simplifying the equipment structure.

[0023] Optionally, the horizontal position of the lifting drive member is located between the horizontal positions of the two discharge ports.

[0024] By adopting the above technical solution, the lifting drive member is arranged between the two discharge ports, which can reduce the powder falling on the lifting drive member, thereby causing the telescopic matching gap of the lifting drive member to get stuck.

[0025] Optionally, the lifting drive member is a cylinder, the piston rod of the cylinder is arranged downward, and the piston rod of the cylinder is connected to the connecting rod.

[0026] By adopting the above technical solution, the piston of the cylinder is arranged downward, which can reduce the situation where the powder blocks the telescopic clearance of the piston rod of the cylinder.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. When the 3D printing device completes a printing job, the two closing parts move vertically away from the corresponding discharge ports, so that the powder in the molding tank is discharged from the two discharge ports. The vibrator vibrates the lifting piston plate and the closing parts to speed up the discharge process of the powder. The two air supply gaps are used to convey airflow, so that the two air supply gaps blow the powder on the lifting piston plate in opposite directions, so that the powder on the lifting piston plate gradually falls outward from the two discharge ports.

[0028] 2. The size of the discharge port along the longitudinal direction of the lifting plate decreases from top to bottom, which can reduce the actual drop range of the discharge port. In addition, since the inclined surfaces of the two discharge ports are inclined relative to each other, the positions of the lower openings of the two discharge ports can be closer, making it easier to collect the powder dropped from the two discharge ports. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0030] Figure 2 This is a schematic diagram of Example 1 for illustrating the connection relationship between the printing platform and the lifting piston mechanism.

[0031] Figure 3It is a schematic diagram of the installation position of the lifting drive assembly of Example 1.

[0032] Figure 4 It is a transverse cross-sectional view of the structure of the air supply gap in Example 1.

[0033] Figure 5 This is a longitudinal sectional view of Example 2 for illustrating the installation position of the buffer guide plate.

[0034] Figure 6 It is a longitudinal cross-sectional view of Example 2 for illustrating the installation position of the air supply component.

[0035] Description of reference numerals: 1. Printing platform; 11. Accommodating cavity; 111. Forming groove; 12. Air supply gap; 13. Quick air joint; 2. Lifting piston mechanism; 21. Lifting piston plate; 211. Discharge port; 212. Inclined surface; 22. Lifting drive assembly; 3. Storage container; 4. Closing assembly; 41. Closing member; 42. Lifting drive member; 43. Vertical rod; 44. Connecting rod; 5. Vibrator; 6. Support member; 61. Side plate; 62. Inclined plate; 63. Material guide channel; 64. Connecting plate; 65. Buffering guide plate; 651. First buffer plate; 652. Second buffer plate; 7. Air supply member; 71. Filter member. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-6 This application is described in further detail.

[0037] Example 1 The present application embodiment discloses a selective laser sintering 3D printing device. Figure 1 and Figure 2 The selective laser sintering 3D printing device includes a printing platform 1, a lifting piston mechanism 2 and a material storage container 3. The printing platform 1 is provided with a receiving chamber 11. The lifting piston mechanism 2 includes a lifting piston plate 21 and a lifting drive assembly 22. The lifting drive assembly 22 is a linear module. The lifting drive assembly 22 is used to drive the lifting piston plate 21 to move up and down in the receiving chamber 11. The area above the lifting piston plate 21 in the receiving chamber 11 is used as a molding groove 111. When the selective laser sintering 3D printing device is working, the molding is printed layer by layer in the molding groove 111. During the process, the lifting drive assembly 22 drives the lifting piston plate 21 to move down layer by layer.

[0038] Reference Figure 2 and Figure 3The shape of the lifting piston plate 21 is adapted to the horizontal section of the accommodating chamber 11. The lifting piston plate 21 is a square structure with rounded corners as a whole. The lifting piston plate 21 is provided with two discharge ports 211. The two discharge ports 211 are arranged side by side in the transverse direction of the lifting piston plate 21 and staggered in the longitudinal direction of the lifting piston plate 21. The two discharge ports 211 are arranged along the entire longitudinal length of the lifting piston plate 21. In this embodiment, the transverse and longitudinal directions of the piston plate refer to the two mutually perpendicular side length directions of the lifting piston plate 21.

[0039] The lifting piston plate 21 is provided with a closing assembly 4, which includes two closing parts 41 and a lifting drive part 42 for driving the two closing parts 41 to move up and down. The two closing parts 41 are respectively used to close the two discharge ports 211. When the discharge port 211 is unloading, the closing part 41 moves to the top of the discharge port 211.

[0040] When the selective laser sintering 3D printing device completes printing and takes the finished product out of the molding groove 111 , the two closing members 41 are moved vertically away from the corresponding discharge ports 211 , so that the powder in the molding groove 111 is discharged from the two discharge ports 211 .

[0041] Reference Figure 2 The longitudinal section of the discharge port 211 is trapezoidal, and the longitudinal dimension of the discharge port 211 along the lifting piston plate 21 gradually decreases from top to bottom. The inner wall of one side of the discharge port 211 is an inclined surface 212 inclined upward, and the inclined surfaces 212 of the two discharge ports 211 are inclined relative to each other.

[0042] The size of the discharge port 211 along the longitudinal direction of the lifting plate decreases from top to bottom, which can reduce the actual drop range of the discharge port 211. In addition, since the inclined surfaces 212 of the two discharge ports 211 are inclined relative to each other, the positions of the lower openings of the two discharge ports 211 can be relatively close, so that the powder falling from the two discharge ports 211 is relatively concentrated.

[0043] Reference Figure 3 and Figure 4 , a vertical rod 43 is fixedly provided on the lower surface of the two closing members 41, and a connecting rod 44 is commonly connected between the vertical rods 43 of the two closing members 41, and the connecting rod 44 is located below the lifting piston plate 21. The horizontal position of the lifting drive member 42 is located between the horizontal positions of the two discharge ports 211. The lifting drive member 42 is a cylinder or an electric push rod, and in this embodiment, it is specifically a cylinder, which is fixedly installed on the downward side of the lifting piston plate 21, the installation surface of the lifting drive member 42 is set upward, and the piston rod of the cylinder is set downward, and the piston rod of the cylinder is connected to the connecting rod 44.

[0044] Reference Figure 4The side walls of the two opposite sides of the accommodating chamber 11 are respectively provided with air supply gaps 12, and the air supply gaps 12 are used to convey airflow. The air supply direction of the air supply gaps 12 is arranged along the transverse direction of the lifting piston plate 21, and the gap width of the air supply gaps 12 gradually increases from the outside to the inside. The accommodating chamber 11 is provided with two quick air joints 13, and the two quick air joints 13 are respectively connected to the two air supply gaps 12, and the quick air joints 13 are used to connect compressed air pipelines or fans, etc.

[0045] Reference Figure 3 A vibrator 5 is fixedly installed on the downward side of the lifting piston plate 21. The vibrator 5 is a straight vibrator, which can vibrate the sealing member 41 and the lifting piston plate 21 in the horizontal direction. When the forming groove 111 is discharged through the discharge port 211, the vibrator 5 vibrates the lifting piston plate 21 and the sealing member 41, which can speed up the discharge process of the powder.

[0046] Reference Figure 2 A support member 6 is fixedly arranged on the downward side of the lifting piston plate 21. The support member 6 is a sheet metal member. The support member 6 includes two parallel side plates 61. The two side plates 61 are respectively connected to the moving parts of the lifting drive assembly 22. An inclined plate 62 is integrally connected between the two side plates 61. A material guide channel 63 is formed between the inclined plate 62 and the two side plates 61. The material storage container 3 is installed below the material guide channel 63. The material guide channel 63 is used to guide the powder falling from the discharge port 211 into the material storage container 3.

[0047] The implementation principle of a selective laser sintering 3D printing device in an embodiment of the present application is as follows: when the 3D printing device completes a printing job, the finished product is taken out from the molding groove 111; then the two closing members 41 are moved vertically away from the corresponding discharge ports 211, so that the powder in the molding groove 111 is discharged from the two discharge ports 211. In this process, the vibrator 5 vibrates the lifting piston plate 21 and the closing member 41 to speed up the unloading process of the powder. When the powder remaining on the lifting piston plate 21 is difficult to continue to fall from the discharge port 211, the two air supply gaps 12 are used to convey airflow, so that the two air supply gaps 12 blow the powder on the lifting piston plate 21 in opposite directions, so that the powder on the lifting piston plate 21 gradually falls outward from the two discharge ports 211. Since the two discharge ports 211 are arranged along the entire longitudinal length of the lifting piston plate 21 , when the two air supply gaps 12 supply air laterally along the lifting piston plate 21 , the powder on the lifting piston plate 21 can be discharged as completely as possible through the two discharge ports 211 .

[0048] Example 2 Reference Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 is that a connecting plate 64 is connected between the two side plates 61 of the support member 6, and the connecting plate 64, the inclined plate 62 and the two side plates 61 together form a material guide channel 63.

[0049] A plurality of buffer guide plates 65 are provided in the material guide channel 63, one side of the buffer guide plate 65 is fixedly connected to the inner wall of the material guide channel 63, and a material guide gap is formed between the other side and the inner wall of the material guide channel 63, and the buffer guide plate 65 gradually tilts downward from the fixed side toward the direction close to the material guide gap; the buffer guide plate 65 includes a first buffer plate 651 and a second buffer plate 652, and the first buffer plate 651 and the second buffer plate 652 are alternately arranged from top to bottom, and the first buffer plate 651 and the second buffer plate 652 are respectively installed on the inner walls of the opposite sides of the material guide channel 63.

[0050] An air supply member 7 is installed on the side wall of the material guide channel 63. The air supply member 7 is close to the upper end of the material guide channel 63. The position of the air supply member 7 is higher than the position of the buffer guide plate 65. The air supply member 7 is a fan. The outlet end of the air supply member 7 is connected to two quick air joints 13 through pipelines, and the inlet end of the air supply member 7 is connected to the material guide channel 63. A filter member 71 is provided at the inlet end of the air supply member 7.

[0051] The air supply member 7 draws air from the material guide channel 63 through the filter member 71, and then blows it into the molding groove 111 through the pipeline in the form of positive pressure airflow, so that negative pressure is formed in the material guide channel 63, so that a pressure difference is formed between the upper and lower sides of the discharge port 211, so that the floating dust in the molding groove 111 enters the material guide channel 63 under the action of the pressure difference, thereby reducing the floating dust stirred up during the powder discharge process. The position of the air supply member 7 is higher than the buffer guide plate 65, and the buffer guide plate 65 can prevent the air at the lower end of the material guide channel 63 from flowing to the air supply member 7, so that the air supply member 7 can easily draw air through the discharge port 211.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A selective laser sintering 3D printing device, characterized in that: The printing platform (1) comprises a accommodating chamber (11), a lifting piston plate (21) is arranged inside the accommodating chamber (11), and a region of the accommodating chamber (11) located above the lifting piston plate (21) serves as a molding groove (111); the lifting piston plate (21) is provided with two discharge ports (211), the two discharge ports (211) are arranged side by side in a transverse direction of the lifting piston plate (21), and are staggered in a longitudinal direction of the lifting piston plate (21), and the two discharge ports (211) are arranged along the entire longitudinal direction of the lifting piston plate (21). The lifting piston plate (21) is provided with two closing members (41) for closing the discharge port (211), and the closing members (41) can be lifted and lowered; the side walls on two opposite sides of the accommodating chamber (11) are respectively provided with air supply slits (12), and the air supply slits (12) are used to convey airflow, and the air supply direction of the air supply slits (12) is arranged in the transverse direction of the lifting piston plate (21); a vibrator (5) is provided on the downward side of the lifting piston plate (21), and the vibrator (5) is used to vibrate the lifting piston plate (21) and the closing member (41).

2. A selective laser sintering 3D printing device according to claim 1, characterized in that: The discharge port (211) has a trapezoidal cross-section along the longitudinal direction. The size of the discharge port (211) along the longitudinal direction of the lifting piston plate (21) gradually decreases from top to bottom. The inner wall of one side of the discharge port (211) is an inclined surface (212) inclined upward. The inclined surfaces (212) of the two discharge ports (211) are arranged to be inclined relative to each other.

3. A selective laser sintering 3D printing device according to claim 1, characterized in that: The vibrator (5) is a direct vibrator, and the direct vibrator is capable of vibrating the sealing member (41) and the lifting piston plate (21) in a transverse direction.

4. A selective laser sintering 3D printing device according to claim 1, characterized in that: It also comprises a material guiding channel (63) and a material storage container (3), wherein the material guiding channel (63) is used to guide the residual material falling from the discharge port (211) into the material storage container (3).

5. A selective laser sintering 3D printing device according to claim 4, characterized in that: A plurality of buffer material guide plates (65) are arranged in the material guide channel (63); one side of the buffer material guide plate (65) is fixedly connected to the inner wall of the material guide channel (63); a material guide gap is formed between the other side and the inner wall of the material guide channel (63); the buffer material guide plate (65) gradually tilts downward from the fixed side toward the direction close to the material guide gap; the buffer material guide plate (65) comprises a first buffer plate (651) and a second buffer plate (652); the first buffer plate (651) and the second buffer plate (652) are alternately arranged from top to bottom; the first buffer plate (651) and the second buffer plate (652) are respectively installed on the inner wall of the opposite side of the material guide channel (63).

6. A selective laser sintering 3D printing device according to claim 5, characterized in that: The width of the air supply gap (12) gradually increases from the outside to the inside.

7. A selective laser sintering 3D printing device according to claim 6, characterized in that: It also comprises an air supply member (7), the outlet end of the air supply member (7) being connected to the air supply gap (12) via a pipeline, the inlet end of the air supply member (7) being connected to the material guide channel (63), and the inlet end of the air supply member (7) being provided with a filter member (71).

8. The selective laser sintering 3D printing device according to claim 1, characterized in that: A lifting drive member (42) is provided on the downward side of the lifting piston plate (21), and the lifting drive member (42) is used to drive the closing member (41) to move upward and downward; vertical rods (43) are provided on the lower surfaces of the two closing members (41), and a connecting rod (44) is commonly connected between the vertical rods (43) of the two closing members (41); the connecting rod (44) is located below the lifting piston plate (21), and the lifting drive member (42) is connected to the connecting rod (44).

9. A selective laser sintering 3D printing device according to claim 8, characterized in that: The horizontal position of the lifting drive member (42) is located between the horizontal positions of the two discharge ports (211).

10. A selective laser sintering 3D printing device according to claim 9, characterized in that: The lifting drive member (42) is a cylinder, the piston rod of the cylinder is arranged downward, and the piston rod of the cylinder is connected to the connecting rod (44).

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