Folding powder spreading device for powder bed

Abstract

The invention provides a folding powder bed powder spreading device which comprises a powder spreading equipment body which is of a sealed box structure and is internally divided into a front bin and a rear bin through a partition plate, a driving mechanism assembly which is arranged in the powder spreading equipment body and comprises an X-axis driving assembly and a Z-axis driving assembly, and a powder spreading executing mechanism which is located in the front bin and connected with the Z-axis driving assembly. The positioning and locking assembly is arranged on the driving mechanism and matched with the powder spreading executing mechanism, and the posture adjusting assemblies are arranged at the two ends of the front bin and change the posture of the powder spreading executing mechanism. The Z-axis driving assembly comprises a shell, a guide rail and a lead screw, a sliding block and a motor achieve vertical movement, and the X-axis driving assembly controls the Z-axis driving assembly to move horizontally through the lead screw, the motor and the guide rail. The powder spreading executing mechanism is composed of a main body plate, a scraper and a positioner, and the posture is locked through a positioning locking assembly. The posture adjusting assembly is composed of parallel flow guide plates and vertical flow guide plates to achieve posture conversion. The device improves powder laying precision, enhances flexibility and adaptability, optimizes space utilization, improves powder management and improves equipment stability.

Description

Technical Field

[0001] The present invention relates to the technical field of powder bed additive manufacturing, and more particularly to a folding powder bed powder spreading device. Background Art

[0002] Currently, the laser powder bed fusion (LPBF) technology has put forward higher requirements for the printing and forming efficiency. The printing process mainly includes the powder bed powder spreading process and the laser melting process. When the printed model entity remains unchanged, that is, when the laser melting process is constant, the method of variable-speed powder spreading is usually adopted to shorten the powder bed powder spreading time to improve the efficiency. That is, after the laser melting, the powder spreading mechanism retracts from the printing position to the starting position, the powder supply bin provides the required powder, the powder spreading mechanism starts the powder spreading movement, moves at a high speed in the non-printing area of the powder bed, and moves at a lower speed in the printing area to ensure the powder spreading effect in the printing area and further shorten the powder spreading time. In this process, the powder spreading device can be divided into three-stage speed movement. After the laser printing is completed, the powder spreading device still takes a certain amount of time to return to the starting position. With the superposition of conventional printing layers (thousands of layers), a large amount of time is consumed.

[0003] The motion control of some powder spreading devices during the powder spreading process is not precise enough. Due to the lack of high-precision driving components and positioning mechanisms, the powder spreading mechanism is prone to deviation during movement and cannot accurately lay the powder at the specified position, thus affecting the forming accuracy of the workpiece. Moreover, inaccurate motion control may also lead to uneven contact between the doctor blade and the powder bed, further exacerbating the unevenness of powder spreading. Summary of the Invention

[0004] Based on the above technical problems, the present invention proposes a folding powder bed powder spreading device.

[0005] The present invention aims to provide a folding powder bed powder spreading device with delicate design and comprehensive functions to solve the above problems existing in the prior art.

[0006] A folding powder bed powder spreading device, characterized by comprising: Powder spreading equipment main body: It has a sealed box structure, and its interior is divided into a front bin and a rear bin by a partition. A driving mechanism is arranged in the rear bin, and the front bin serves as the powder spreading working area. A powder supply cylinder, a forming cylinder, a powder overflow tank, and an air flow circulation mechanism are arranged in the middle of the bottom plate. Driving mechanism assembly: It is arranged inside the powder spreading equipment and includes an X-axis driving component and a Z-axis driving component controlled by the X-axis driving component, and is used to realize the motion control of the powder spreading mechanism in the X-axis and Z-axis directions. Powder spreading execution mechanism: It is located inside the front bin, is connected to the Z-axis driving component, and is jointly controlled by the X-axis driving component and the Z-axis driving component to complete the powder spreading operation. Positioning and locking component: It is arranged on the driving mechanism and cooperates with the powder spreading actuator to lock the powder spreading actuator in different postures. Posture adjustment component: It is arranged in the front chamber and can change the posture of the powder spreading actuator at both ends of the front chamber, so that it can be in a vertical posture and a parallel posture.

[0007] Preferably, the Z-axis driving component mainly consists of a housing, a Z-axis guide rail, a Z-axis lead screw, a Z-axis slider and a Z-axis motor. Among them, the Z-axis lead screw is vertically installed in the middle position inside the housing and is driven by the Z-axis motor to rotate; when the Z-axis lead screw rotates, it drives the Z-axis slider to move up and down in the vertical direction. Z-axis guide rails are symmetrically arranged on both sides of the Z-axis lead screw, and both ends of the Z-axis slider form a sliding fit with the Z-axis guide rails. The powder spreading actuator is fixedly connected to the Z-axis slider.

[0008] Preferably, the X-axis driving component consists of an X-axis lead screw, an X-axis motor and an X-axis guide rail (513). The X-axis lead screw is in the middle position, and an X-axis guide rail is arranged on each side of it; a connecting seat is arranged at the rear side of the housing of the Z-axis driving component, and a lead screw hole and a sliding hole matching the X-axis lead screw and the X-axis guide rail are opened on the connecting seat. The X-axis motor drives the X-axis lead screw to rotate, so as to realize the movement of the Z-axis driving component along the X-axis direction.

[0009] Preferably, the powder spreading actuator consists of a main body plate, a scraper and a locator. The rear side of the main body plate is connected to one end of the connecting plate by a hinge, and the other end of the connecting plate is fixed to the Z-axis driving component. The scraper is fixedly arranged along the lower edge of the main body plate, and the locator is fixed at the rear side of the upper end of the main body plate. There are two positioning holes on the locator, namely a vertical hole and a parallel hole. The positioning and locking component is fixed above the positioning holes and locks the posture of the main body plate through cooperation with the positioning holes.

[0010] Preferably, the positioning and locking component is fixed on the Z-axis driving component, and a controllable telescopic positioning rod is arranged on it. The positioning rod is located above the positioning holes. When the positioning rod extends downward, it can be inserted into the positioning holes, and then the main body plate is locked in the corresponding posture.

[0011] Preferably, the posture adjustment component consists of a parallel flow guide plate and a vertical flow guide plate. The parallel flow guide plate and the vertical flow guide plate are respectively fixed at both ends of the front chamber in the X-axis direction. When the main body plate moves to the parallel flow guide plate, its posture changes to be parallel to the X-axis, that is, the parallel posture; when the main body plate moves to the vertical flow guide plate, its posture becomes perpendicular to the X-axis, that is, the vertical posture.

[0012] Preferably, the parallel deflector is composed of an inclined section and a horizontal section connected end to end. Among them, the horizontal section is parallel to the X-axis guide rail, one end of which is fixedly connected to the first side plate of the powder spreading device, the other end is connected to the inclined section, and there is a gap between the horizontal section and the partition plate. When the main body plate continuously moves towards the first side plate, the main body in the vertical posture gradually changes to a parallel posture and enters the gap.

[0013] Preferably, the vertical deflector is a concave arc plate. When the main body plate in the parallel posture continuously moves towards it, the main body plate will gradually change from the parallel posture to the vertical posture.

[0014] Beneficial effects: 1. Improve powder spreading accuracy: Through the precise cooperation of the X-axis drive assembly and the Z-axis drive assembly, and the stable locking of the posture of the powder spreading actuator by the positioning and locking assembly, the powder spreading mechanism can achieve precise movement and posture maintenance in different directions, ensuring that the scraper can accurately spread the powder to the specified position, improving the uniformity and accuracy of powder spreading, and thus enhancing the quality of additive manufacturing products; 2. Enhance flexibility and adaptability: The posture adjustment assembly can enable the powder spreading actuator to flexibly switch between the vertical posture and the parallel posture. While laser printing, it can complete the high-speed movement of the powder spreading mechanism from the printing position to the starting position, and then combine with the high-speed movement of the X-axis drive assembly to the printing area, and the low-speed movement of the powder spreading device in the printing area to the printing position, realizing the low-speed folding of the powder spreading mechanism, the high-speed movement to the retraction position, and the low-speed movement to the starting position. The overall process is carried out in parallel with the laser light output for printing. Combined with the superposition of the conventional number of printing layers (thousands of layers), the printing efficiency is improved; 4. Improve the stability of the equipment: The main body of the powder spreading device with a sealed box structure, as well as the reasonable layout and connection method between components, enhance the structural stability of the entire device, reduce the errors caused by factors such as vibration during operation, and ensure the reliability and stability of the powder spreading operation. Description of the drawings

[0015] Figure 1 Shows the structural schematic of the present invention Figure 1 ; Figure 2 Shows the structural schematic of the present invention Figure 2 ; Figure 3 Shows the structural schematic of the drive mechanism Figure 1 ; Figure 4 Shows the structural schematic of the drive mechanism Figure 2 ; Figure 5 Shows the structural schematic diagram of the Z-axis drive assembly; Figure 6 Shows the schematic diagram of the powder spreading start stage; Figure 7 Shows a schematic diagram of the powder spreading completion stage; Figure 8 Shows a state diagram of the main board starting to fold; Figure 9 Shows a horizontal attitude diagram of the main board; Figure 10 Shows a state diagram of the main board folding back; Figure 11 Shows a schematic diagram of the starting position of the main board folding back to the correct position; Figure 12 Shows a schematic diagram of the state of the main board folding back to the correct position; Figure 13 Shows a vertical attitude diagram of the main board returning to the correct position; In the drawings, 1 is the main body of the powder spreading device, 2 is the partition board, 3 is the front bin, 4 is the rear bin, 5 is the driving mechanism, 6 is the powder supply cylinder, 7 is the forming cylinder, 8 is the powder overflow tank, 9 is the air flow circulation mechanism, 10 is the powder spreading execution mechanism, 11 is the positioning and locking component, 12 is the attitude adjustment component, 101 is the first side plate, 102 is the second side plate, 510 is the X-axis driving component, 511 is the X-axis lead screw, 512 is the X-axis motor, 513 is the X-axis guide rail, 520 is the Z-axis driving component, 521 is the housing, 522 is the Z-axis guide rail, 523 is the Z-axis lead screw, 524 is the Z-axis slider, 525 is the Z-axis motor, 526 is the connecting seat, 5261 is the lead screw hole, 5262 is the sliding hole, 901 is the air outlet, 902 is the air suction port, 1001 is the main board, 1002 is the scraper, 1003 is the locator, 1004 is the connecting plate, 1005 is the positioning hole, 10051 is the vertical hole, 10052 is the parallel hole, 1101 is the positioning rod, 1201 is the parallel flow guide plate, 1202 is the vertical flow guide plate, 12011 is the inclined section, 12012 is the horizontal section. Detailed implementation manners

[0016] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0017] Such as Figures 1 to 13 A folding powder bed powder spreading device is composed of five major parts: the main body 1 of the powder spreading device, the driving mechanism 5 assembly, the powder spreading execution mechanism 10, the positioning and locking component 11, and the attitude adjustment component 12.

[0018] The main body 1 of the powder spreading device: The main body 1 of the powder spreading device has a sealed box structure. This sealed design helps to maintain the stability of the internal working environment and reduce the interference of external factors on the powder spreading process. Inside it, the front chamber 3 and the rear chamber 4 are clearly separated by a partition 2. The main function of the rear chamber 4 is to accommodate the driving mechanism 5 and provide a relatively stable installation and operation space for the driving mechanism 5. The front chamber 3 serves as the key powder spreading working area, where a powder supply cylinder 6, a forming cylinder 7, a powder overflow trough 8, and an air flow circulation mechanism 9 are carefully arranged in the middle of the bottom plate. The powder supply cylinder 6 is responsible for storing and supplying powder to the powder spreading area, providing raw materials for the powder spreading operation; the forming cylinder 7 is the area where the powder is finally formed and is one of the core areas of the entire additive manufacturing process; the powder overflow trough 8 is used to collect the excess powder that overflows during the powder spreading process, avoiding the disorderly scattering of powder in the working area and affecting the powder spreading effect and equipment operation; the air flow circulation mechanism 9 drives the air flow to flow in the working area. It includes an air outlet 901 and an air suction port 902, which are arranged opposite to each other front and back, and the air flow passes through the forming cylinder 7, promoting the uniform distribution of the powder and further improving the quality of powder spreading.

[0019] Assembly of the driving mechanism 5: The assembly of the driving mechanism 5 is arranged inside the powder spreading device and is a key part to realize the precise movement of the powder spreading mechanism. It includes an X-axis driving component 510 and a Z-axis driving component 520 controlled by the X-axis driving component 510. These two driving components cooperate with each other to achieve precise movement control of the powder spreading mechanism in the X-axis and Z-axis directions. Specifically, the Z-axis driving component 520 mainly consists of a housing 521, a Z-axis guide rail 522, a Z-axis lead screw 523, a Z-axis slider 524, and a Z-axis motor 525. The Z-axis lead screw 523 is vertically installed in the middle position inside the housing 521. This layout can ensure a stable and concentrated driving force in the Z-axis direction. The Z-axis motor 525 drives the Z-axis lead screw 523 to rotate. Through the principle of screw drive, the rotational movement is converted into the up and down movement of the Z-axis slider 524 in the vertical direction. Z-axis guide rails 522 are symmetrically arranged on both sides of the Z-axis lead screw 523. This not only provides precise guidance for the movement of the Z-axis slider 524, ensuring the straightness of its movement, but also enhances the stability of the entire structure. The two ends of the Z-axis slider 524 form a sliding fit relationship with the Z-axis guide rails 522, enabling the Z-axis slider 524 to slide smoothly on the Z-axis guide rails 522. The powder spreading actuator 10 is fixedly connected to the Z-axis slider 524, thus realizing the precise lifting movement of the powder spreading actuator 10 in the Z-axis direction and meeting the requirements of different powder spreading thicknesses.

[0020] The X-axis drive assembly 510 consists of an X-axis lead screw 511, an X-axis motor 512, and an X-axis guide rail 513. The X-axis lead screw 511 is in the middle position, and an X-axis guide rail 513 is arranged on each side of it. This design of double-sided guide rails can further improve the stability and accuracy of the Z-axis drive assembly 520 when moving in the X-axis direction. A connecting seat 526 is provided at the rear side of the housing 521 of the Z-axis drive assembly 520. A lead screw hole 5261 and a sliding hole 5262 that match the X-axis lead screw 511 and the X-axis guide rail 513 are opened on the connecting seat 526. The X-axis motor 512 drives the X-axis lead screw 511 to rotate, so that the Z-axis drive assembly 520 moves along the X-axis direction, and then drives the powder spreading actuator 10 connected to it to translate in the X-axis direction, realizing the coverage of the powder spreading operation in the horizontal direction.

[0021] Powder spreading actuator 10: The powder spreading actuator 10 is located inside the front chamber 3 and directly undertakes the core task of powder spreading. It consists of a main body plate 1001, a scraper 1002, and a locator 1003. The rear side of the main body plate 1001 is connected to one end of a connecting plate 1004 by a hinge, and the other end of the connecting plate 1004 is firmly fixed to the Z-axis drive assembly 520. This connection method enables the main body plate 1001 to flexibly lift and translate under the drive of the Z-axis drive assembly 520. The scraper 1002 is fixedly arranged along the lower edge of the main body plate 1001. When the main body plate 1001 moves, the scraper 1002 can evenly spread the powder provided by the powder supply cylinder 6 on the powder bed above the forming cylinder 7. The locator 1003 is fixed at the rear side of the upper end of the main body plate 1001, and two positioning holes 1005 are provided on it, namely a vertical hole 10051 and a parallel hole 10052. The positioning and locking assembly 11 cooperates with these two positioning holes 1005 to realize the locking of the posture of the main body plate 1001, ensuring that the main body plate 1001 can maintain a stable posture during the powder spreading process, and further ensuring the stable contact angle and pressure between the scraper 1002 and the powder bed, improving the uniformity and accuracy of powder spreading.

[0022] Positioning and locking assembly 11: The positioning and locking component 11 is fixed on the Z-axis drive component 520 and is an important component to ensure the stable posture of the powder spreading actuator 10. A position rod 1101 that can be telescopically controlled is arranged thereon. The position rod 1101 is located above the positioning hole 1005. When the position rod 1101 extends downward, it can accurately insert into the positioning hole 1005, and then lock the main body plate 1001 in the corresponding posture. For example, when the main body plate 1001 is in a vertical posture, the position rod 1101 inserts into the vertical hole 10051; when the main body plate 1001 is in a parallel posture, the position rod 1101 inserts into the parallel hole 10052. Whether in a vertical posture or a parallel posture, it can ensure that the main body plate 1001 will not shake or change its posture during movement, providing a reliable guarantee for precise powder spreading.

[0023] Posture adjustment component 12: The posture adjustment component 12 is arranged in the front chamber 3 and can change the posture of the powder spreading actuator 10 at both ends of the front chamber 3, so that it can be in a vertical posture and a parallel posture, greatly enhancing the flexibility and adaptability of the powder spreading device. This component is composed of a parallel deflector 1201 and a vertical deflector 1202. The parallel deflector 1201 and the vertical deflector 1202 are respectively fixed at both ends of the front chamber 3 in the X-axis direction. When the main body plate 1001 moves to the parallel deflector 1201, its posture will change to be parallel to the X-axis, that is, the parallel posture. This posture is suitable for retracting the powder spreading actuator 10 after the powder spreading operation is completed and resetting it to move to the other end to avoid affecting the laser printing action.

[0024] Specifically, the parallel deflector 1201 is composed of an inclined section 12011 and a horizontal section 12012 that are connected end to end. Among them, the horizontal section 12012 is parallel to the X-axis guide rail 513. One end of it is fixedly connected to the first side plate 101 of the powder spreading device, and the other end is connected to the inclined section 12011. There is a gap between the horizontal section 12012 and the partition plate 2. When the main body plate 1001 continuously moves towards the first side plate 101, the main body plate 1001 in the vertical posture will gradually change to the parallel posture under the guidance of the inclined section 12011 and enter this gap.

[0025] When the main body plate 1001 in the parallel posture moves to the vertical deflector 1202, its posture will change to be perpendicular to the X-axis, that is, the vertical posture. This posture is suitable for performing the powder spreading operation and can ensure that the doctor blade 1002 spreads the powder at an angle perpendicular to the powder bed, improving the uniformity and quality of the powder spreading. The vertical deflector 1202 is a concave arc-shaped plate. When the main body plate 1001 in the parallel posture continuously moves towards it, the main body plate 1001 will gradually change from the parallel posture to the vertical posture under the guidance of the arc-shaped plate, realizing a smooth transition of the posture.

[0026] Such as Figure 13As shown in the figure, in the front chamber 3, the direction from the second side plate 102 to the first side plate 101 is left, and the direction from the first side plate to the second side plate 102 is right. From right to left in sequence are: the vertical deflector 1202, the powder supply cylinder 6, the forming cylinder 7, the powder overflow tank 8, and the parallel deflector 1201.

[0027] The bottom plate of the front chamber 3 is divided into a starting area (blue area) and a printing area (green area). The printing area also includes a printing position (red area). The starting area is from the position where the main board 1001 is in a vertical posture under the guidance of the vertical deflector 1202 along the powder spreading direction to the right side of the powder supply cylinder 6. The printing area is connected to the starting area, that is, from the right side of the powder supply cylinder 6 to the left side of the powder overflow tank 8 (the parallel deflector 1201 is located on the left side of the powder overflow tank 8). The printing position is the area covering the forming cylinder 7.

[0028] When the main board 1001 is in a vertical posture at the vertical deflector 1202, the positioning and locking assembly 11 is inserted into the vertical hole 10051 to lock the main board 1001 in the vertical posture. When the doctor blade 1002 moves from left to right along with the main board 1001, it moves at a high speed in the starting area to the printing area and moves at a low speed in the printing area. After completing the powder spreading, the positioning and locking assembly 11 releases the lock, and laser melting starts at the printing position; subsequently, the main board 1001 changes to a parallel posture under the guidance of the parallel deflector 1201, and the positioning and locking assembly 11 is inserted into the parallel hole 10052 to complete the locking. Then, the X-axis drive assembly drives it to reset to the starting position. Since the main board 1001 is in a parallel posture and is located behind the forming cylinder 7, it will not affect the progress of laser melting; as the main board 1001 continues to move towards the vertical deflector 1202, the front end of the main board 1001 first contacts the vertical deflector 1202, and the positioning and locking assembly 11 releases the lock. Since the vertical deflector 1202 has a curvature, the front end of the main board 1001 slides along the curvature, and the main board 1001 will gradually change to a vertical state, and then the positioning and locking assembly locks again, and the powder spreading work is repeated.

[0029] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A folding powder bed powder spreading device, characterized in that Comprising: Powder spreading equipment main body (1): It has a sealed box structure. Inside, it is divided into a front chamber (3) and a rear chamber (4) by a partition plate (2). A driving mechanism (5) is arranged in the rear chamber (4). The front chamber (3) serves as the powder spreading working area, and a powder supply cylinder (6), a forming cylinder (7), a powder overflow tank (8), and an air flow circulation mechanism (9) are arranged in the middle of its bottom plate; Driving mechanism (5) assembly: It is arranged inside the powder spreading equipment and includes an X-axis driving component (510) and a Z-axis driving component (520) controlled by the X-axis driving component (510), and is used to realize the motion control of the powder spreading mechanism in the X-axis and Z-axis directions; Powder spreading execution mechanism (10): It is located inside the front chamber (3), is connected to the Z-axis driving component (520), and is jointly controlled by the X-axis driving component (510) and the Z-axis driving component (520) to complete the powder spreading operation; Positioning and locking component (11): It is arranged on the driving mechanism (5) and cooperates with the powder spreading execution mechanism (10) to realize the locking of different postures of the powder spreading execution mechanism (10); Posture adjustment component (12): It is arranged inside the front chamber (3) and can change the posture of the powder spreading execution mechanism (10) at both ends of the front chamber (3) so that it can be in a vertical posture and a parallel posture.

2. The foldable powder bed powder spreading device according to claim 1, wherein: The Z-axis driving component (520) is mainly composed of a housing (521), a Z-axis guide rail (522), a Z-axis lead screw (523), a Z-axis slider (524), and a Z-axis motor (525). Among them, the Z-axis lead screw (523) is vertically installed in the middle position inside the housing (521) and is driven by the Z-axis motor (525) to rotate. When the Z-axis lead screw (523) rotates, it drives the Z-axis slider (524) to move up and down in the vertical direction. Z-axis guide rails (522) are symmetrically arranged on both sides of the Z-axis lead screw (523). Both ends of the Z-axis slider (524) form a sliding fit relationship with the Z-axis guide rails (522). The powder spreading execution mechanism (10) is fixedly connected to the Z-axis slider (524).

3. The foldable powder bed powder spreading device according to claim 2, characterized in that: The X-axis driving component (510) is composed of an X-axis lead screw (511), an X-axis motor (512), and an X-axis guide rail (513); the X-axis lead screw (511) is in the middle position, and an X-axis guide rail (513) is arranged on each side of it; a connecting seat (526) is arranged on the rear side of the housing (521) of the Z-axis driving component (520). A lead screw hole (5261) and a sliding hole (5262) matching the X-axis lead screw (511) and the X-axis guide rail (513) are opened on the connecting seat (526). The X-axis motor (512) drives the X-axis lead screw (511) to rotate, thereby realizing the movement of the Z-axis driving component (520) along the X-axis direction.

4. The powder bed coating device for folding according to claim 1, wherein: The powder spreading actuator (10) consists of a main body plate (1001), a scraper (1002) and a positioner (1003). The rear side of the main body plate (1001) is connected to one end of a connecting plate (1004) by means of hinge, and the other end of the connecting plate (1004) is fixed to the Z-axis drive assembly (520). The scraper (1002) is fixedly arranged along the lower edge of the main body plate (1001). The positioner (1003) is fixed at the rear side part of the upper end of the main body plate (1001). There are two positioning holes (1005) on the positioner (1003), namely a vertical hole (10051) and a parallel hole (10052). The positioning and locking assembly (11) is fixed above the positioning holes (1005) and realizes the locking of the attitude of the main body plate (1001) through cooperation with the positioning holes (1005).

5. The foldable powder bed powder spreading device according to claim 4, wherein: The positioning and locking assembly (11) is fixed to the Z-axis drive assembly (520), and is provided with a position rod (1101) that can be controlled to stretch. The position rod (1101) is located above the positioning holes (1005). When the position rod (1101) extends downward, it can be inserted into the positioning holes (1005), thereby locking the main body plate (1001) in the corresponding attitude.

6. The foldable powder bed powder spreading device according to claim 4, wherein: The attitude adjustment assembly (12) consists of a parallel flow guide plate (1201) and a vertical flow guide plate (1202). The parallel flow guide plate (1201) and the vertical flow guide plate (1202) are respectively fixed at both ends of the front chamber (3) in the X-axis direction. When the main body plate (1001) moves to the position of the parallel flow guide plate (1201), its attitude changes to be parallel to the X-axis, that is, the parallel attitude; when the main body plate (1001) moves to the position of the vertical flow guide plate (1202), its attitude becomes perpendicular to the X-axis, that is, the vertical attitude.

7. The foldable powder bed powder spreading device according to claim 6, characterized in that: The parallel flow guide plate (1201) is composed of an inclined section (12011) and a horizontal section (12012) connected end to end. Among them, the horizontal section (12012) is parallel to the X-axis guide rail (513). One end of it is connected and fixed to the first side plate (101) of the powder spreading device, and the other end is connected to the inclined section (12011). There is a gap between the horizontal section (12012) and the partition plate (2). When the main body plate (1001) continuously moves towards the first side plate (101), the main body in the vertical attitude gradually changes to the parallel attitude and enters this gap.

8. The foldable powder bed powder spreading device according to claim 6, characterized in that: The vertical flow guide plate (1202) is a concave arc-shaped plate. When the main body plate (1001) in the parallel attitude continuously moves towards it, the main body plate (1001) will gradually change from the parallel attitude to the vertical attitude.

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