A two-way powder spreading device for additive manufacturing equipment

Abstract

The present invention relates to the field of additive manufacturing technology, and particularly to a two-way powder spreading device for an additive manufacturing equipment, which has the characteristics of being able to precisely control the powder feeding amount before and after the doctor blade and having good powder feeding stability. It includes a frame, at least one driving mechanism, two first guiding mechanisms, two second guiding mechanisms, two connecting seats, a support seat, a first powder box, a second powder box, a doctor blade mechanism, a first positioning mechanism and a second positioning mechanism. The two first guiding mechanisms are respectively arranged on the transverse two sides of the frame, the two connecting seats are respectively arranged on the two first guiding mechanisms, the driving mechanism is connected with the connecting seats, the support seat is horizontally arranged on the two connecting seats, the upper surface of the support seat has a support plane, the doctor blade mechanism is arranged at the lower end of the support seat, the first powder box is arranged at the front end of the support seat, the second powder box is distributed at the rear end of the support seat, the second powder box includes a powder storage bin and a powder guiding bin, and the two second guiding mechanisms are respectively arranged on the connecting seats.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and particularly relates to a two-way powder spreading device for an additive manufacturing apparatus. Background Art

[0002] Additive manufacturing technology is an advanced manufacturing technology with distinct characteristics such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, rapidity, and a rich variety of material types. Since it is not restricted by the complexity of part shapes and does not require any tooling and dies, its application scope is very wide. As one of the additive manufacturing technologies, selective laser sintering technology has also developed very rapidly in recent years. Its main process is as follows: the powder feeding device sends a certain amount of powder to the workbench surface, the powder spreading device spreads a layer of powder material evenly on the upper surface of the piston-formed part, the galvanometer controls the laser to scan the solid part of the powder layer according to the cross-sectional contour of this layer, raising the temperature of the powder to the melting point, melting and sintering the powder and bonding it to the previously formed part below; when one cross-section is sintered, the workbench descends by the thickness of one layer, the powder spreading device spreads another layer of uniform and dense powder on it, and scans and sinters the new cross-section. After several layers of scanning and superposition, the entire three-dimensional solid manufacturing is completed.

[0003] Traditional powder spreading devices mostly have a one-way powder spreading structure. Each time powder is spread, they must return to the powder supply position (i.e., the powder dropping device), resulting in a long powder spreading time and low efficiency. Patent application publication number CN111376474A discloses a powder dropping and two-way powder spreading device suitable for additive manufacturing. The powder dropping and two-way powder spreading device includes a powder supply device, a work chamber top plate, a powder dropping valve, a powder spreading device, and a work panel from top to bottom. A forward spring ejecting device and a reverse spring ejecting device are respectively arranged behind and in front of the powder spreading device. The powder dropping valve is fixed on the powder dropping valve fixing plate, and the powder dropping valve fixing plate is fixed through the work chamber top plate. Holes are provided in the middle of both the work chamber top plate and the powder dropping valve fixing plate. The upper part of the holes communicates with the inside of the powder supply device. One end of the powder dropping valve communicates with the holes, and the other end communicates with the powder spreading device. The powder spreading device includes a box body, a height adjustment component, and a scraper component. The height adjustment component is located on both sides of the box body, and the scraper component is located below the box body. The height adjustment component and the scraper component are connected. A powder dividing block is arranged inside the box body. An upper powder dropping port is provided in the middle above the box body. A lower cover plate and a powder dropping control plate are provided below the box body. The shape of the powder dividing block is triangular. The apex angle of the powder dividing block is located at the center of the upper powder dropping port. The bottom of the powder dividing block is fixed on the lower cover plate, and the width of the bottom of the powder dividing block is smaller than the width of the lower cover plate. Front and rear powder dropping ports are respectively provided at the front and rear ends of the lower cover plate. The powder dropping control plate is located below the lower cover plate and is movably connected to the box body through two scraping plates. Front and rear powder outlets are provided on the powder dropping control plate. In the non-working state, the front powder dropping port and the front powder outlet are staggered from each other, and the rear powder dropping port and the rear powder outlet are staggered from each other.

[0004] The above patent uses a slotted powder separation plate. When the scraper moves to the front and rear limits, a spring device pushes the powder separation plate to align the originally vertically misaligned slots, and at this time, the powder drops. However, since the contact area between the powder separation plate and the upper and lower plates is large and the degree of freedom is small, if the installation gap is too small, it is easy to cause insufficient powder output due to excessive friction caused by adhesion after the powder absorbs moisture. If the gap is too large, it is easy to shake off the powder during the movement of the scraper, and the horizontal stability requirements for the powder separation plate are relatively high, resulting in poor stability of the device. And this device generally uses a mechanical structure to evenly distribute the powder dropped by the upper powder dropping device to the front and rear of the powder distribution plate. This scheme is only evenly distributed in theory and cannot accurately control the front and rear powder feeding amounts in practice. Equipment installation errors and powder jamming are likely to cause inconsistent front and rear powder amounts and printing failures. Summary of the Invention

[0005] Therefore, in view of the above problems, the present invention provides a two-way powder spreading device for an additive manufacturing device that can accurately control the front and rear powder dropping amounts of the scraper and has good powder dropping stability.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A two-way powder spreading device for an additive manufacturing device includes a frame, at least one driving mechanism, two first guiding mechanisms, two second guiding mechanisms, two connecting seats, a support seat, a first powder box, a second powder box, a scraper mechanism, a first positioning mechanism, and a second positioning mechanism. It is defined that the direction extending along the length of the frame is the longitudinal direction, and the direction extending along the width of the frame is the transverse direction. The frame has a front end and a rear end at both longitudinal ends.

[0008] The two first guiding mechanisms are respectively arranged on the two transverse sides of the frame. The two connecting seats are respectively arranged on the two first guiding mechanisms. The driving mechanism is connected to the connecting seat and is used to drive the connecting seat to move along the longitudinal direction of the first guiding mechanism. The support seat is arranged on the two connecting seats along the transverse direction. The upper surface of the support seat has a support plane. The scraper mechanism is arranged at the lower end of the support seat. The first powder box is arranged at the front end of the support seat. The first powder box has a first powder inlet distributed at the upper end and a first powder outlet distributed at the lower end. The second powder box is distributed at the rear end of the support seat. The second powder box includes a powder storage bin and a powder guiding bin. The two second guiding mechanisms are respectively arranged on the connecting seats. The powder storage bin is arranged on the two second guiding mechanisms along the transverse direction. The powder storage bin has a second powder inlet distributed at the upper end and a second powder outlet distributed at the lower end. The powder guiding bin is arranged at the rear end of the support seat. The powder guiding bin has a third powder inlet distributed at the upper end and a third powder outlet distributed at the lower end. The first positioning mechanism is arranged at the front end of the frame, and the second positioning mechanism is arranged at the rear end of the frame.

[0009] When the powder storage bin is at the front end of the second guide mechanism, the second powder outlet of the powder storage bin rests on the supporting plane; when the powder storage bin is at the rear end of the second guide mechanism, the second powder outlet of the powder storage bin is connected to the third powder inlet of the powder guide bin.

[0010] Furthermore, the second guide mechanism includes a second guide rail and a second slider arranged on the second guide rail, and a top block is provided between the second slider and the powder storage bin. When the support seat is at the front end of the first guide mechanism, the front end of the top block abuts against the first positioning mechanism; when the support seat is at the rear end of the first guide mechanism, the rear end of the top block abuts against the second positioning mechanism.

[0011] Furthermore, the scraper mechanism includes a scraper base locked on the support seat, a first clamping plate fixed on the scraper base, a second clamping plate locked on the first clamping plate, two side plates respectively locked on the two lateral sides of the scraper base, and a scraper, a convex plate is vertically provided on the longitudinal middle part of the inner side surfaces of the two side plates, and clamping grooves are recessed at the lower ends and facing surfaces of the first clamping plate and the second clamping plate, the scraper is embedded in the clamping groove, and the lateral ends of the scraper are against the convex plates.

[0012] Furthermore, outer edges of the lower ends of the first clamping plate and the second clamping plate are both provided with rounded corner structures.

[0013] Furthermore, the outer sides of the two side panels are provided with a powder scraper.

[0014] Furthermore, a powder guide groove is provided at the front end of the support seat.

[0015] Furthermore, a powder guide plate is provided at the front end of the support seat and located on the upper side of the powder guide groove, and a recessed groove connected to the powder guide groove is provided on the lower surface of the rear end of the powder guide plate. An inclined powder guide surface is provided on the side of the powder guide plate close to the first powder box, and a through groove connected to the powder guide groove is provided at the lower part of the powder guide surface.

[0016] Furthermore, powder cleaning brushes are provided at the front and rear ends of the frame.

[0017] Furthermore, the driving mechanism includes a ball screw arranged on the first guide mechanism and a driving motor connected to one end of the ball screw.

[0018] Furthermore, there are two driving mechanisms, and the two driving mechanisms are respectively connected to two connecting seats.

[0019] By adopting the foregoing technical solution, the beneficial effects of the present invention are as follows: For the bidirectional powder spreading device used in the additive manufacturing equipment, the first powder box and the second powder box are independently arranged, and the second powder box includes a powder storage bin and a powder guiding bin. During use, the driving mechanism drives the first powder box and the second powder box on the support seat to the rear end and below the powder dropping device. At this time, the second powder outlet of the powder storage bin of the second powder box abuts against the support plane, that is, the second powder outlet is closed. Then, the upper powder dropping device independently supplies powder in a fixed quantity. After the powder filling is completed, the driving mechanism drives the support seat to move along the guiding direction of the first guiding mechanism to the front end. At this time, the powder in the first powder box drops, and the powder is evenly spread by the doctor blade mechanism. When the support seat is driven to the front end, the top block abuts against the first positioning mechanism, pushing the powder storage bin to move backward along the guiding direction of the second guiding mechanism, so that the second powder outlet of the powder storage bin communicates with the third powder inlet of the powder guiding bin. Then, the driving mechanism drives the support seat to move along the guiding direction of the first guiding mechanism to the front end. At this time, the powder in the powder storage bin of the second powder box drops, and the powder is evenly spread by the doctor blade mechanism. When the support seat is driven to the rear end, the top block abuts against the second positioning mechanism, pushing the powder storage bin to move forward along the guiding direction of the second guiding mechanism. At this time, the second powder outlet of the powder storage bin of the second powder box abuts against the support plane. In this way, the bidirectional powder spreading function is realized by reciprocating. With such a design, the first powder box and the second powder box are filled with powder respectively, which can more accurately control the powder spreading amount before and after, is beneficial to saving powder and controlling powder, helps the powder spreading amount to change at any time when the layer thickness function changes, realizes accurate powder dropping for the first powder box and the second powder box respectively, and has good powder dropping stability. At the same time, the structure of the single doctor blade mechanism is simple, easy to replace, easy to adjust, and has low use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the support seat at the front end of the first guiding mechanism in an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of the support seat at the front end of the first guiding mechanism in a state where one driving mechanism is omitted in an embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of the support seat at the rear end of the first guiding mechanism in a state where one driving mechanism is omitted in an embodiment of the present invention;

[0023] Figure 4 is a schematic top view structural diagram of the storage bin at the front end of the second guiding mechanism in an embodiment of the present invention;

[0024] Figure 5 is a schematic top view structural diagram of the storage bin at the rear end of the second guiding mechanism in an embodiment of the present invention;

[0025] Figure 6It is a schematic view from below of the storage bin at the rear end of the second guiding mechanism in the embodiment of the present invention;

[0026] Figure 7 It is a schematic exploded view in the first state in the embodiment of the present invention;

[0027] Figure 8 It is a schematic exploded view in the second state in the embodiment of the present invention;

[0028] Figure 9 It is a schematic exploded view in the third state in the embodiment of the present invention;

[0029] Figure 10 It is a three-dimensional structure schematic view of the powder guiding plate in the top view state in the embodiment of the present invention;

[0030] Figure 11 It is a three-dimensional structure schematic view of the powder guiding plate in the bottom view state in the embodiment of the present invention;

[0031] Figure 12 It is a partial sectional structure schematic view in the embodiment of the present invention;

[0032] Figure 13 It is Figure 12 a sectional structure schematic view at A-A in

[0033] Figure 14 It is a three-dimensional structure schematic view of another state in the implementation of the present invention.

[0034] Explanation of reference numerals:

[0035] 1. Frame; 2. Driving mechanism; 3. First guiding mechanism; 4. Second guiding mechanism; 5. Connecting seat; 6. Support seat; 7. First powder box; 8. Second powder box; 9. Scraper mechanism; 10. First positioning mechanism; 11. Second positioning mechanism; 12. Top block; 13. Powder dropping device; 14. Powder scraping plate; 15. Powder filtering plate; 16. Powder guiding groove; 17. Powder guiding plate; 18. Relief groove; 19. Powder guiding surface; 20. Through groove; 30. Powder cleaning brush;

[0036] 21. Ball screw; 22. Driving motor; 31. First guide rail; 32. First slider; 41. Second guide rail; 42. Second slider;

[0037] 60. Support plane; 71. First powder inlet; 72. First powder outlet; 81. Powder storage bin; 82. Powder guiding bin; 83. Second powder inlet; 84. Second powder outlet; 85. Third powder inlet; 86. Third powder outlet;

[0038] 91. scraper base; 92. first clamping plate; 93. second clamping plate; 94. side plate; 95. scraper; 96. convex plate; 97. clamping groove; 98. rounded corner structure. DETAILED DESCRIPTION

[0039] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0040] The embodiments of the present invention are:

[0041] refer to Figures 1 to 14 As shown, a bidirectional powder spreading device for additive manufacturing equipment includes a frame 1, two driving mechanisms 2, two first guide mechanisms 3, two second guide mechanisms 4, two connecting seats 5, a supporting seat 6, a first powder box 7, a second powder box 8, a scraper mechanism 9, a first positioning mechanism 10 and a second positioning mechanism 11, wherein the longitudinal direction extending along the length direction of the frame 1 is defined as the longitudinal direction, and the width direction extending along the frame is defined as the transverse direction, and the frame has a front end and a rear end located at both ends of the longitudinal direction;

[0042] The two first guide mechanisms 3 are respectively arranged on the lateral sides of the frame 1, the two connecting seats 5 are respectively arranged on the two first guide mechanisms 3, the driving mechanism 2 is connected to the connecting seat 5, and is used to drive the connecting seat 5 to move along the longitudinal direction of the first guide mechanism 3, the supporting seat 6 is erected on the two connecting seats 5 along the lateral direction, the upper surface of the supporting seat 6 has a supporting plane 60, the scraper mechanism 9 is arranged at the lower end of the supporting seat 6, the first powder box 7 is arranged at the front end of the supporting seat 6, the first powder box 7 has a first powder inlet 71 distributed at the upper end and a first powder outlet 72 distributed at the lower end, and the second powder box 8 is divided into The second powder box 8 is arranged at the rear end of the support seat 6, and includes a powder storage bin 81 and a powder guide bin 82. The two second guide mechanisms 4 are respectively arranged on the connecting seat 5. The powder storage bin 81 is mounted on the two second guide mechanisms 4 in the transverse direction. The powder storage bin 81 has a second powder inlet 83 distributed at the upper end and a second powder outlet 84 distributed at the lower end. The powder guide bin 82 is arranged at the rear end of the support seat 6. The powder guide bin 82 has a third powder inlet 85 distributed at the upper end and a third powder outlet 86 distributed at the lower end. The first positioning mechanism 10 is arranged at the front end of the frame 1, and the second positioning mechanism 11 is arranged at the rear end of the frame 1.

[0043] When the powder storage bin 81 is at the front end of the second guide mechanism 4 , the second powder outlet 84 of the powder storage bin 81 abuts against the support plane 60 ; when the powder storage bin 81 is at the rear end of the second guide mechanism 4 , the second powder outlet 84 of the powder storage bin 81 is connected to the third powder inlet 85 of the powder guide bin 82 .

[0044] In this embodiment, the driving mechanism 2 includes a ball screw 21 disposed on the first guiding mechanism 3 and a driving motor 22 connected to one end of the ball screw 21. The first guiding mechanism 3 includes a first guide rail 31 and a first slider 32 disposed on the first guide rail 31. The second guiding mechanism 4 includes a second guide rail 41 and a second slider 42 disposed on the second guide rail 41. A top block 12 is provided between the second slider 42 and the powder storage bin 81. When the support base 6 is at the front end of the first guiding mechanism 3, the front end of the top block 12 abuts against the first positioning mechanism 10; when the support base 6 is at the rear end of the first guiding mechanism 3, the rear end of the top block 12 abuts against the second positioning mechanism 11. Both the first positioning mechanism 10 and the second positioning mechanism 11 are hydraulic dampers, and the driving motor 22 is a servo motor.

[0045] The number of the above-mentioned driving mechanisms 2 is two, and the two driving mechanisms 2 are respectively connected to two connecting seats 5. This transmission structure is optimized with greater rigidity, and the powder spreading device runs more stably. The guiding mechanism of the high-precision dust-proof ball screw 21 and the guide rail slider driven by the servo system enables the powder spreading system to have high left-right synchronization accuracy and high bidirectional powder spreading consistency, without phenomena such as insufficient rigidity and inclination, left-right position deviation, etc., and has a high dust-proof level and can work stably for a long time; of course, a driving mechanism can also be set, which can also achieve the guiding effect, but the running stability of the powder spreading device is relatively poor.

[0046] The two-way powder spreading device for additive manufacturing equipment has the first powder box 7 and the second powder box 8 independently arranged. The second powder box 8 includes a powder storage bin 81 and a powder guiding bin 82. During use, the driving mechanism 2 drives the first powder box 7 and the second powder box 8 on the support base 6 to the rear end and under the powder dropping device 13. At this time, the second powder outlet 84 of the powder storage bin 81 of the second powder box 8 abuts against the support plane 60, that is, the second powder outlet 84 is closed. Then, the upper powder dropping device 13 independently supplies powder in a fixed quantity. After the powder filling is completed, the driving mechanism 2 drives the support base 6 to move along the guiding direction of the first guiding mechanism 3 to the front end. At this time, the powder in the first powder box 7 drops, and the powder is evenly spread by the doctor blade mechanism 9. When the support base 6 is driven to the front end, the top block abuts against the first positioning mechanism 10, pushing the powder storage bin 81 to move backward along the guiding direction of the second guiding mechanism 4, so that the second powder outlet 84 of the powder storage bin 81 communicates with the third powder inlet 85 of the powder guiding bin 82. Then, the driving mechanism 2 drives the support base 6 to move along the guiding direction of the first guiding mechanism 3 to the front end. At this time, the powder in the powder storage bin 81 of the second powder box 8 drops, and the powder is evenly spread by the doctor blade mechanism 9. When the support base 6 is driven to the rear end, the top block 12 abuts against the second positioning mechanism 11, pushing the powder storage bin 81 to move forward along the guiding direction of the second guiding mechanism 4. At this time, the second powder outlet 84 of the powder storage bin 81 of the second powder box 8 abuts against the support plane 60. In this way, the two-way powder spreading function is realized by reciprocating. With such a design, the first powder box and the second powder box are filled with powder respectively, which can more accurately control the powder spreading amount before and after, is beneficial to saving powder and controlling powder, helps the powder spreading amount per layer to change at any time when the layer thickness function changes, realizes accurate powder dropping of the first powder box 7 and the second powder box 8 respectively, and has good powder dropping stability. At the same time, the structure of the single doctor blade mechanism 9 is simple, easy to replace, easy to adjust, and has low use cost.

[0047] At the same time, the transverse two ends of the powder storage bin 81 of the second powder box 8 are connected to the second guiding mechanism 4 of the rail and slider structure, and cooperate with the first positioning mechanism 10 and the second positioning mechanism 11 arranged at the front and rear ends of the frame 1. After contact, it moves passively. The friction coefficient of the slider is small, and the movement is smooth. Moreover, only the bottom surface of the powder storage bin 81 has movement friction, the contact area is small, the operation stability is good and the operation safety is high, avoiding the problem of powder jamming.

[0048] Furthermore, the scraper mechanism 9 includes a scraper base 91 locked on the support seat 6, a first clamping plate 92 fixed on the scraper base 91, a second clamping plate 93 locked on the first clamping plate 92, two side plates 94 respectively locked on the two lateral sides of the scraper base 91, and a scraper 95, a convex plate 96 is vertically provided in the longitudinal middle part of the inner side surface of the two side plates 94, a clamping groove 97 is recessed at the lower end and facing surface of the first clamping plate 92 and the second clamping plate 93, the scraper 95 is embedded in the clamping groove 97, and the lateral ends of the scraper 95 abut against the convex plate 96, the outer edges of the lower ends of the first clamping plate 92 and the second clamping plate 93 are provided with chamfered structures 98, the scraper mechanism 9 of this structure is simple in structure, and the scraper 95 is easy to disassemble, replace and adjust the gap, so that the stability of the powder spreading is good.

[0049] In addition, the outer sides of the two side plates 94 are provided with powder scraping plates 14 for scraping off excess powder at both ends of the scraper 95 .

[0050] At the same time, a powder guide groove 16 is provided at the front end of the support seat 6, and a powder guide plate 17 is provided at the front end of the support seat 6 and located on the upper side of the powder guide groove. The lower surface of the rear end of the powder guide plate 17 is recessed with a makeshift groove 18 connected to the powder guide groove. The side of the powder guide plate 17 close to the first powder box is provided with an inclined powder guide surface 19, and the lower part of the powder guide surface 19 is penetrated by a through groove 20 connected to the powder guide groove 16. Excess powder on the supporting plane 60 is squeezed out by the powder guide groove 16 through the movement of the powder storage bin 81, and there will be no failure of forward and backward movement caused by powder jamming, and excess powder in the blanking is guided by the powder guide surface 19 and discharged by the through groove 20 and the powder guide groove 16, thereby improving the convenience of use.

[0051] Furthermore, the front and rear ends of the frame 1 are provided with powder cleaning brushes 30, which can effectively prevent the powder from sticking to the sides of the first clamping plate 92, the second clamping plate 93 and the scraper rubber strip mounting member, causing it to fall during movement and affect the powder spreading effect.

[0052] In addition, a powder filter plate 15 is provided in the powder storage bin 81 , and the powder filter plate 15 is provided with a plurality of filter holes, so that the powder can be evenly spread in the powder storage bin 81 after entering, and the amount of powder discharged can be controlled at the same time.

[0053] 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 one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly defined or limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0056] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention as defined by the appended claims, and all such changes are within the protection scope of the present invention.

Claims

1. A bidirectional powder spreading device for additive manufacturing equipment, characterized in that: The machine comprises a frame, at least one driving mechanism, two first guide mechanisms, two second guide mechanisms, two connecting seats, a supporting seat, a first powder box, a second powder box, a scraper mechanism, a first positioning mechanism and a second positioning mechanism, wherein the longitudinal direction extending along the length direction of the frame is defined as a longitudinal direction, and the width direction extending along the frame is defined as a transverse direction, and the frame has a front end and a rear end located at both ends of the longitudinal direction; The two first guide mechanisms are respectively arranged on the lateral sides of the frame, the two connecting seats are respectively arranged on the two first guide mechanisms, the driving mechanism is connected to the connecting seat, and is used to drive the connecting seat to move along the longitudinal direction of the first guide mechanism, the support seat is mounted on the two connecting seats along the lateral direction, the upper surface of the support seat has a supporting plane, the scraper mechanism is arranged at the lower end of the support seat, the first powder box is arranged at the front end of the support seat, the first powder box has a first powder inlet distributed at the upper end and a first powder outlet distributed at the lower end, the second powder box is distributed at the rear end of the support seat, the second powder box includes a powder storage bin and a powder guide bin, the two second guide mechanisms are respectively arranged on the connecting seat, the powder storage bin is mounted on the two second guide mechanisms along the lateral direction, the powder storage bin has a second powder inlet distributed at the upper end and a second powder outlet distributed at the lower end, the powder guide bin is arranged at the rear end of the support seat, the powder guide bin has a third powder inlet distributed at the upper end and a third powder outlet distributed at the lower end, the first positioning mechanism is arranged at the front end of the frame, and the second positioning mechanism is arranged at the rear end of the frame; The front end of the support seat is provided with a powder guide groove, the front end of the support seat and located on the upper side of the powder guide groove is provided with a powder guide plate, the lower surface of the rear end of the powder guide plate is concavely provided with a clearance groove connected with the powder guide groove, the side of the powder guide plate close to the first powder box is provided with an inclined powder guide surface, and the lower part of the powder guide surface is penetrated with a through groove connected with the powder guide groove; When the powder storage bin is at the front end of the second guide mechanism, the second powder outlet of the powder storage bin rests on the supporting plane; when the powder storage bin is at the rear end of the second guide mechanism, the second powder outlet of the powder storage bin is connected to the third powder inlet of the powder guide bin.

2. The bidirectional powder spreading device for additive manufacturing equipment according to claim 1, characterized in that: The second guide mechanism includes a second guide rail and a second slider arranged on the second guide rail. A top block is provided between the second slider and the powder storage bin. When the support seat is at the front end of the first guide mechanism, the front end of the top block abuts against the first positioning mechanism; when the support seat is at the rear end of the first guide mechanism, the rear end of the top block abuts against the second positioning mechanism.

3. The bidirectional powder spreading device for additive manufacturing equipment according to claim 2, characterized in that: The scraper mechanism includes a scraper base locked on a support seat, a first clamping plate fixed on the scraper base, a second clamping plate locked on the first clamping plate, two side plates respectively locked on the two lateral sides of the scraper base, and a scraper, a convex plate is vertically provided in the longitudinal middle part of the inner side surface of the two side plates, and clamping grooves are recessed at the lower ends and facing surfaces of the first clamping plate and the second clamping plate, the scraper is embedded in the clamping groove, and the lateral ends of the scraper are against the convex plates.

4. The bidirectional powder spreading device for additive manufacturing equipment according to claim 3, characterized in that: The outer edges of the lower ends of the first clamping plate and the second clamping plate are both provided with rounded corner structures.

5. The bidirectional powder spreading device for additive manufacturing equipment according to claim 4, characterized in that: The outer sides of the two side plates are both provided with powder scraping plates.

6. The bidirectional powder spreading device for additive manufacturing equipment according to any one of claims 1 to 5, characterized in that: The front end and the rear end of the frame are both provided with powder cleaning brushes.

7. The bidirectional powder spreading device for additive manufacturing equipment according to claim 6, characterized in that: The driving mechanism comprises a ball screw arranged on the first guide mechanism and a driving motor connected to one end of the ball screw.

8. The bidirectional powder spreading device for additive manufacturing equipment according to claim 6, characterized in that: There are two driving mechanisms, and the two driving mechanisms are respectively connected to two connecting seats.

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