A powder spreading device for 3D printer

Abstract

The present invention relates to the technical field of 3D printers, and specifically discloses a powder spreading device for a 3D printer, comprising a frame and a powder spreading mechanism arranged in the frame, a powder box being arranged in the frame, the powder box comprising two side panels one arranged along the length direction of the frame, two side panels two, a bottom plate arranged at the bottom of the side panels one and two, and a connecting mechanism, adjacent side panels one and two are slidably matched, a plurality of bottom plates are arranged along the length direction and width direction of the frame, the connecting mechanism is used to clamp and lock and unlock two adjacent bottom plates, the side panels one and two are used to drive the connecting mechanism to move, after the side panels one and two are slidably adjusted, the connecting mechanism directly below the side panels one and two is driven to move, and the bottom plate directly below the side panels one and two and the bottom plate inside the powder box are unlocked; the powder spreading device for a 3D printer of the present invention has the effect of reducing the phenomenon of powder waste.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printers, and in particular to a powder spreading device for a 3D printer. Background Art

[0002] 3D printer, also known as three-dimensional printer, is a machine of cumulative manufacturing technology, that is, rapid prototyping technology. It is based on a digital model file and uses special wax materials, powdered metal or plastic and other adhesive materials to print layers of adhesive materials to create three-dimensional objects. At this stage, 3D printers are used to manufacture products, and objects are constructed by layer-by-layer printing. The principle of 3D printer is to put data and raw materials into the 3D printer, and the machine will build the product layer by layer according to the program.

[0003] The biggest difference between 3D printers and traditional printers is that the "ink" they use is real raw materials. There are many different forms of stacked thin layers, and the types of media that can be used for printing are diverse, from a variety of plastics to metals, ceramics, and rubber-like substances. Some printers can also combine different media to make the printed object hard on one end and soft on the other.

[0004] The Chinese patent application document with publication number CN114290667A discloses a powder spreading device and a 3D printer. The powder spreading device includes a workbench, a powder box, a powder lowering assembly, and a powder spreading assembly. The workbench has a powder lowering area and a powder spreading area. The powder box is arranged above the powder lowering area. The powder lowering assembly is connected to the powder box. The powder spreading assembly is movably connected to the workbench along a preset direction. The powder lowering assembly is used to be connected to the powder spreading assembly in a transmission manner to drive the powder lowering assembly to quantitatively discharge materials to the powder lowering area, and spread the materials in the powder lowering area to the powder spreading area. During the operation of the powder spreading device, the powder spreading assembly can be connected to the powder spreading assembly in a transmission manner to drive the powder lowering assembly to quantitatively discharge materials to the powder lowering area, and spread the materials in the powder lowering area to the powder spreading area, through the movement of the powder spreading assembly relative to the workbench in a preset direction.

[0005] In the above technology, when the powder spreading device needs to process objects of different sizes, it is difficult to adjust the size of the forming cylinder, which will result in more powder being spread and a waste of powder. Summary of the invention

[0006] The present invention provides a powder spreading device for a 3D printer, aiming to solve the technical problem in the prior art that when the powder spreading device needs to process objects of different sizes, it is difficult to adjust the size of the forming cylinder, resulting in more powder being spread and powder waste.

[0007] A powder spreading device for a 3D printer of the present invention comprises a frame and a powder spreading mechanism arranged in the frame, a powder box is arranged in the frame, the powder box comprises two side panels 1 arranged along the length direction of the frame, two side panels 2 arranged along the width direction of the frame, a bottom plate arranged at the bottom of the side panels 1 and 2, and a connecting mechanism arranged in the bottom plate, the adjacent side panels 1 and 2 are slidably matched, the bottom plate is provided with multiple ones along the length direction and the width direction of the frame, the connecting mechanism is used to clamp and lock and unlock the two adjacent bottom plates, the side panels 1 and 2 are used to drive the connecting mechanism to move, and after the side panels 1 and 2 are slidably adjusted, the connecting mechanism directly below the side panels 1 and 2 is driven to move, and the bottom plate directly below the side panels 1 and 2 and the bottom plate inside the powder box are unlocked.

[0008] Beneficial effect: through the setting of side panel one, side panel two and the connecting mechanism, when the size of the powder box needs to be adjusted, the two side panels one and the two side panels two are slid and adjusted to adjust the length and width of the powder box. After the adjustment is completed, the side panels one and two drive the connecting mechanism directly below the side panels one and two to move, and the bottom plate directly below the side panels one and two and the bottom plate inside the powder box are unlocked. At this time, the side panels one, side panel two and the bottom plate under the side panels one and two form a powder box of the required size, and then the powder is spread, which can reduce the waste of powder.

[0009] Preferably, a snap-in groove is provided on the side of the base plate, and the connecting mechanism includes a snap-in block 1, a snap-in block 2 and a rotating component for driving the snap-in block 1 and the snap-in block 2 to slide. The rotating component drives the snap-in block 1 and the snap-in block 2 to slide, and when they slide into the base plate, the two adjacent base plates are unlocked.

[0010] Beneficial effect: the rotating assembly drives the clamping block 1 and the clamping block 2 to slide. When the clamping block 1 and the clamping block 2 slide into the bottom plate, the two adjacent bottom plates are no longer clamped and locked. When the clamping block 1 and the clamping block 2 slide into the adjacent bottom plates, the two adjacent bottom plates are clamped and locked.

[0011] Preferably, the rotating assembly includes a telescopic rod for driving the clamping block 1 and the clamping block 2 to slide, a rotating sleeve for driving the telescopic rod to rotate, and a lifting rod for driving the rotating sleeve to rotate, the lifting rod is vertically slidably engaged with the bottom plate, the side plate 1 and the side plate 2 are magnetically attracted to the lifting rod, and the rotating sleeve is rotatably engaged with the bottom plate.

[0012] Preferably, an elastic member for pressing the lifting rod downward is arranged in the bottom plate, a spiral groove is provided on the lifting rod, and a spherical block matched with the spiral groove is provided on the rotating sleeve.

[0013] Beneficial effect: When side panel 1 and side panel 2 move to the corresponding bottom panel, side panel 1 and side panel 2 adsorb the lifting rod, causing the lifting rod to rise and compress the elastic part. The rising of the lifting rod drives the rotating sleeve to rotate, and the rotating sleeve drives the clamping block 1 and the clamping block 2 to slide and adjust.

[0014] Preferably, a pushing device is provided in the frame, and the pushing device includes a pushing block slidably matched with the side plate one and the side plate two and a driving member for driving the pushing block to slide, the pushing block is used to push the side plate one and the side plate two to slide, one end of the driving member is connected to the pushing block, and the other end is slidably matched with the frame.

[0015] Beneficial effect: by setting the pushing device and starting the driving member, the side panels 1 and 2 can be driven to slide through the pushing block, thereby realizing convenient sliding adjustment of the side panels 1 and 2.

[0016] Preferably, an adjusting device 1 is provided around the powder box, and the adjusting device 1 includes a mounting frame arranged on the top of the powder box, a retractable roller rotatably cooperated with the mounting frame, and a sealing piece 1 for sealing the gap between the side plate 1 and the side plate 2 after adjustment, one end of the sealing piece 1 is wound around the retractable roller, and the other end is connected to the powder box.

[0017] Beneficial effect: Through the setting of the adjusting device 1, when the side plate 1 and the side plate 2 are in the sliding adjustment process, they can drive the sealing piece 1 to move, and then drive the sealing piece 1 to be retracted and unreeled, and the gap between the side plate 1 and the side plate 2 after adjustment is blocked by the sealing piece 1, thereby reducing the phenomenon of powder falling from the gap during the paving process and causing powder waste.

[0018] Preferably, a winding device is provided in the mounting frame, and the winding device includes a sliding rod that slides in a horizontal direction and cooperates with the winding roller, and a torsion spring for driving the winding roller to wind up the blocking piece, one end of the torsion spring is connected to the sliding rod, and the other end is connected to the winding roller.

[0019] Preferably, a second regulating device is provided around the powder box, and the second regulating device has the same structure as the first regulating device.

[0020] Preferably, the mounting frame is telescopically fitted to the powder box along a horizontal direction.

[0021] Preferably, collecting boxes for collecting powder are provided at the four corners of the top of the powder box.

[0022] The beneficial effects of the present invention are:

[0023] 1. In the present invention, by setting the side panel one, the side panel two and the connecting mechanism, when the size of the powder box needs to be adjusted, the two side panels one and the two side panels two are slid and adjusted to achieve the adjustment of the length and width of the powder box. After the adjustment is completed, the side panel one and the side panel two drive the connecting mechanism directly below the side panel one and the side panel two to move, and the bottom plate directly below the side panel one and the side panel two and the bottom plate inside the powder box are unlocked. At this time, the side panel one, the side panel two and the bottom plate under the side panel one and the side panel two form a powder box of the required size, and then the powder is spread, which can reduce the waste of powder.

[0024] 2. In the present invention, through the setting of the adjusting device 1, when the side plate 1 and the side plate 2 are in the sliding adjustment process, it can drive the sealing piece 1 to move, and then drive the sealing piece 1 to be retracted and unreeled, and the gap between the side plate 1 and the side plate 2 after adjustment is blocked by the sealing piece 1, thereby reducing the phenomenon that the powder material is easy to fall from the gap during the paving process and cause the waste of powder material. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a structural schematic diagram showing the connection relationship between the powder box and the frame of the present invention.

[0027] Figure 3 It is a partial cross-sectional view of the present invention.

[0028] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0029] Figure 5 It is a structural schematic diagram of the present invention showing the connection relationship between the side plate 1 and the bottom plate.

[0030] Figure 6 It is a partial cross-sectional view showing the connection relationship between the retractable roller and the mounting frame of the present invention.

[0031] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle.

[0032] Reference numerals:

[0033] 1. Frame; 2. Powder spreading mechanism; 3. Powder box; 31. Side panel 1; 32. Side panel 2; 33. Bottom plate; 331. Snap-in groove; 332. Limit rod; 34. Snap-in block 1; 35. Snap-in block 2; 36. Rotating assembly; 361. Telescopic rod; 362. Rotating sleeve; 363. Lifting rod; 4. Elastic member; 5. Pushing device; 51. Pushing block; 52. Driving member; 6. Adjusting device 1; 61. Mounting frame; 62. Retracting and releasing roller; 63. Sealing piece 1; 7. Rewinding device; 71. Sliding rod; 72. Torsion spring; 8. Adjusting device 2; 9. Collecting box; 10. Cylinder. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0035] Reference Figure 1-Figure 7 The present invention discloses a powder spreading device for a 3D printer, comprising a frame 1 and a powder spreading mechanism 2 arranged in the frame 1, a powder box 3 arranged in the frame 1, and the powder spreading mechanism 2 is used to spread the powder in the powder box 3, the powder box 3 comprises two side panels 1 31 arranged along the length direction of the frame 1, two side panels 2 32 arranged along the width direction of the frame 1, a bottom plate 33 arranged at the bottom of the side panels 1 31 and the side panels 2 32, and a connecting mechanism arranged in the bottom plate 33, and a cylinder 10 is fixedly arranged in the frame 1, and the piston rod of the cylinder 10 is fixedly connected to the bottom plate 33 located in the middle position. When it is necessary to spread the powder, the powder in the powder box 3 is scraped by the powder spreading mechanism 2, and then the powder is spread in the powder spreading box, and the cylinder 10 is started at the same time to drive the multiple bottom plates 33 to rise, thereby lifting the powder inside the powder box 3, and the powder spreading operation is performed after the powder is scraped by the powder spreading mechanism 2.

[0036] Reference Figure 2 and Figure 5 The bottom of the side panels 1 31 and 32 are provided with sliding grooves, and the bottoms of the adjacent side panels 1 31 and 32 are provided with sliders adapted to the sliding grooves. The adjacent side panels 1 31 and 32 are slidably matched with each other. A pushing device 5 is provided in the frame 1, and the pushing device 5 includes a pushing block 51 slidably matched with the side panels 1 31 and 32 and a driving member 52 for driving the pushing block 51 to slide. The sides of the side panels 1 31 and 32 are provided with sliding grooves, and the pushing block 51 is a T-shaped structure. The pushing block 51 is used to push the side panels 1 31 and 32 to slide. The driving member 52 directly adopts a hydraulic cylinder, and one end of the driving member 52 is fixedly connected to the pushing block 51, and the other end is slidably matched with the frame 1.

[0037] Reference Figure 2-Figure 5The bottom plate 33 is provided with a plurality of bottom plates along the length and width directions of the frame 1. A limit rod 332 is fixedly provided on the lower surface of the bottom plate 33. A limit hole matching the limit rod 332 is provided on the frame 1. The limit rod 332 is inserted into the limit hole along the vertical direction. The four sides of the bottom plate 33 are provided with a clamping groove 331. The connecting mechanism is used to clamp and lock two adjacent bottom plates 33 and unlock them. The side plate 1 31 and the side plate 2 32 are used to drive the connecting mechanism to move. After the side plate 1 31 and the side plate 2 32 are slidably adjusted, the connecting mechanism directly below the side plate 1 31 and the side plate 2 32 is driven to move, and the bottom plate 33 directly below the side plate 1 31 and the side plate 2 32 and the bottom plate 33 inside the powder box 3 are unlocked.

[0038] Among them, refer to Figure 2-Figure 5 The connecting mechanism includes a clamping block 1 34, a clamping block 2 35 and a rotating assembly 36 for driving the clamping block 1 34 and the clamping block 2 35 to slide. The clamping block 1 34 and the clamping block 2 35 are both arranged in a "concave" shape, and the length of the side of the clamping block 2 35 along the width direction of the clamping groove 331 is greater than the length of the side of the clamping block 1 34, so that the rotating assembly 36 drives the clamping block 1 34 and the clamping block 2 35 to slide, and the clamping block 2 35 can push the adjacent clamping block 1 34 to slide out of the clamping groove 331, and when the clamping block 1 34 and the clamping block 2 35 completely slide into the bottom plate 33, the two adjacent bottom plates 33 are unlocked.

[0039] Reference Figure 2-Figure 5 The rotating assembly 36 includes a telescopic rod 361 for driving the clamping block 1 34 and the clamping block 2 35 to slide, a rotating sleeve 362 for driving the telescopic rod 361 to rotate, and a lifting rod 363 for driving the rotating sleeve 362 to rotate. The lifting rod 363 is matched with the bottom plate 33 along the vertical sliding direction. The lifting rod 363 is made of magnetic material. The side plate 1 31 and the side plate 2 32 are magnetically attracted to the lifting rod 363; a spiral groove is opened on the lifting rod 363, and the spiral groove is arranged along the vertical direction. The rotating sleeve 362 is rotatably matched with the bottom plate 33, and a spherical block adapted to the spiral groove is fixedly arranged on the rotating sleeve 362. One end of the telescopic rod 361 is fixedly connected to the rotating sleeve 362, and the other end is rotatably matched with the clamping block 1 34 and the clamping block 2 35. An elastic member 4 for pressing the lifting rod 363 downward is arranged in the bottom plate 33 . The elastic member 4 is directly a spring. One end of the elastic member 4 is fixedly connected to the lifting rod 363 , and the other end is fixedly connected to the bottom plate 33 .

[0040] Reference Figure 2 , Figure 6 and Figure 7, the powder box 3 is provided with an adjustment device 6 around it, which includes a mounting frame 61 arranged on the top of the powder box 3, a retracting roller 62 rotatably matched in the mounting frame 61, and a blocking piece 63 for blocking the gap between the side plate 1 31 and the side plate 2 32 after adjustment. The mounting frame 61 is telescopically matched with the powder box 3 in the horizontal direction, and the end of the mounting frame 61 away from the side plate 1 31 or the side plate 2 32 is a fixed end fixed on the frame 1, and the other end is a sliding end. One end of the blocking piece 63 is wound around the retracting roller 62, and the other end is fixedly connected to the side plate 1 31 or the side plate 2 32 of the powder box 3. The powder box 3 is provided with an adjustment device 8 around it, and the adjustment device 8 has the same structure as the adjustment device 6, and is used to block the gap between the side plate 1 31 and the side plate 2 32 after adjustment.

[0041] Reference Figure 2 , Figure 6 and Figure 7 A winding device 7 is provided in the mounting frame 61, and the winding device 7 is used to adjust the winding and unwinding of the blocking piece 63. The winding device 7 includes a sliding rod 71 that slides along the horizontal direction and cooperates with the winding roller 62, and a torsion spring 72 that drives the winding roller 62 to wind up the blocking piece 63. One end of the torsion spring 72 is fixedly connected to the sliding rod 71, and the other end is fixedly connected to the winding roller 62.

[0042] Reference Figure 1 and Figure 2 The four corners on the top of the powder box 3 are provided with a collecting box 9 for collecting the powder in the gap between the sealing piece 1 63 of the adjusting device 1 6 and the sealing piece 1 63 of the adjusting device 2 8, and the bottom of the collecting box 9 is provided with a discharge port.

[0043] The implementation principle of the powder spreading device for a 3D printer of the present invention is as follows: when the powder spreading operation is required, the size of the powder box 3 is adjusted first, and during the adjustment, the driving member 52 is started to drive the two side plates 1 31 to slide and adjust in the direction of approaching or moving away from each other, and after the adjustment is completed, the driving member 52 is started to drive the two side plates 2 32 to slide and adjust in the direction of approaching or moving away from each other, and after the powder box 3 is adjusted to the required size, the driving member 52 is closed;

[0044] When the side plate 1 31 and the side plate 2 32 are slidingly adjusted in the direction of approaching each other, the blocking piece 1 63 of the adjusting device 1 6 and the blocking piece 1 63 of the adjusting device 2 8 are pulled to slide, and the blocking piece 1 63 drives the retracting roller 62 to rotate, unwinds the blocking piece 1 63, and compresses the torsion spring 72. When the side plate 1 31 and the side plate 2 32 are slidingly adjusted in the direction of moving away from each other, the torsion spring 72 releases its elastic restoring force, drives the retracting roller 62 to rotate, and rewinds the blocking piece 1 63.

[0045] After the sliding adjustment of the side panels 1 31 and 2 32 is completed, the inner side surface of the side panel 1 31 is flush with the inner side surface of the bottom plate 33 below the side panel 1 31, and the inner side surface of the side panel 2 32 is flush with the inner side surface of the bottom plate 33 below the side panel 2 32. The magnetic attraction of the side panels 1 31 and 2 32 will pull the lifting rod 363 up and compress the elastic member 4. When the lifting rod 363 rises, the rotating sleeve 362 is driven to rotate through the spiral groove, and the rotating sleeve 362 drives the telescopic rod 361 to rotate while extending and retracting, thereby driving the clamping block 1 34 and the clamping block 2 35 to slide, and the clamping block 1 34 and the clamping block 2 35 slide into the bottom plate 33. At this time, the two adjacent bottom plates 33 are no longer clamped and locked (the state is as shown in FIG. Figure 4 As shown), the size of the bottom of the powder box 3 formed by the multiple bottom plates 33 is adjusted;

[0046] After the size of the powder box 3, the adjusting device 1 6 and the adjusting device 2 8 are adjusted, the powder spreading mechanism 2 is started. After the powder in the powder box 3 is scraped by the powder spreading mechanism 2, the powder is spread in the powder spreading box. At the same time, the cylinder 10 is started to drive the multiple bottom plates 33 on the inner sides of the two side panels 1 31 and the two side panels 2 32 to rise, thereby lifting the powder inside the powder box 3, and the powder spreading operation is carried out after the powder is scraped layer by layer by the powder spreading mechanism 2.

[0047] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A powder spreading device for a 3D printer, comprising a frame (1) and a powder spreading mechanism (2) arranged in the frame (1), characterized in that: A powder box (3) is arranged in the frame (1), and the powder box (3) comprises two side panels (31) arranged along the length direction of the frame (1), two side panels (32) arranged along the width direction of the frame (1), a bottom plate (33) arranged at the bottom of the side panels (31) and the side panels (32), and a connecting mechanism arranged in the bottom plate (33), wherein the adjacent side panels (31) and the side panels (32) are slidably matched, and the bottom plate (33) is arranged along the length of the frame (1). A plurality of bottom plates (33) are provided in the direction and width direction, the connecting mechanism is used to lock and unlock two adjacent bottom plates (33), the side plate one (31) and the side plate two (32) are used to drive the connecting mechanism to move, after the side plate one (31) and the side plate two (32) are slidably adjusted, the connecting mechanism directly below the side plate one (31) and the side plate two (32) is driven to move, and the bottom plate (33) directly below the side plate one (31) and the side plate two (32) and the bottom plate (33) inside the powder box (3) are unlocked.

2. A powder spreading device for a 3D printer according to claim 1, characterized in that: A clamping groove (331) is provided on the side surface of the bottom plate (33), and the connecting mechanism comprises a clamping block 1 (34) and a clamping block 2 (35) slidably engaged in the clamping groove (331), and a rotating assembly (36) for driving the clamping block 1 (34) and the clamping block 2 (35) to slide, and when the rotating assembly (36) drives the clamping block 1 (34) and the clamping block 2 (35) to slide and slide into the bottom plate (33), two adjacent bottom plates (33) are unlocked.

3. A powder spreading device for a 3D printer according to claim 2, characterized in that: The rotating assembly (36) comprises a telescopic rod (361) for driving the first clamping block (34) and the second clamping block (35) to slide, a rotating sleeve (362) for driving the telescopic rod (361) to rotate, and a lifting rod (363) for driving the rotating sleeve (362) to rotate, wherein the lifting rod (363) is slidably matched with the bottom plate (33) along the vertical direction, the first side plate (31) and the second side plate (32) are magnetically attracted to the lifting rod (363), and the rotating sleeve (362) is rotationally matched with the bottom plate (33).

4. A powder spreading device for a 3D printer according to claim 3, characterized in that: An elastic member (4) for pressing the lifting rod (363) downward is arranged in the bottom plate (33); a spiral groove is provided on the lifting rod (363); and a spherical block matching the spiral groove is provided on the rotating sleeve (362).

5. A powder spreading device for a 3D printer according to claim 1, characterized in that: A pushing device (5) is arranged in the frame (1), and the pushing device (5) comprises a pushing block (51) slidably matched with the side plate 1 (31) and the side plate 2 (32) and a driving member (52) used to drive the pushing block (51) to slide, the pushing block (51) is used to push the side plate 1 (31) and the side plate 2 (32) to slide, one end of the driving member (52) is connected to the pushing block (51), and the other end is slidably matched with the frame (1).

6. A powder spreading device for a 3D printer according to claim 1, characterized in that: An adjusting device (6) is arranged around the powder box (3), and the adjusting device (6) comprises a mounting frame (61) arranged on the top of the powder box (3), a retracting roller (62) rotatably engaged in the mounting frame (61), and a blocking piece (63) for blocking the gap between the side plate (31) and the side plate (32) after adjustment, one end of the blocking piece (63) is wound around the retracting roller (62), and the other end is connected to the powder box (3).

7. A powder spreading device for a 3D printer according to claim 6, characterized in that: A winding device (7) is arranged in the mounting frame (61), and the winding device (7) comprises a sliding rod (71) that slides along the horizontal direction and cooperates with the winding roller (62), and a torsion spring (72) that is used to drive the winding roller (62) to wind up the blocking piece 1 (63), one end of the torsion spring (72) is connected to the sliding rod (71), and the other end is connected to the winding roller (62).

8. A powder spreading device for a 3D printer according to claim 7, characterized in that: The powder material box (3) is provided with a second regulating device (8) around its periphery. The second regulating device (8) has the same structure as the first regulating device (6).

9. A powder spreading device for a 3D printer according to claim 6, characterized in that: The mounting frame (61) is telescopically fitted to the powder box (3) along a horizontal direction.

10. The powder spreading device for a 3D printer according to claim 1, characterized in that: Collection boxes (9) for collecting powder are provided at the four corners of the top of the powder box (3).

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