Bidirectional powder spreading device for additive manufacturing equipment

Abstract

The invention relates to the technical field of additive manufacturing, in particular to a bidirectional powder spreading device for additive manufacturing equipment, which has the characteristics of capability of accurately controlling the front and back powder feeding amount of a scraper and good powder feeding stability. Comprising a rack, 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, the two first guide mechanisms are arranged on the two transverse sides of the rack correspondingly, and the two connecting seats are arranged on the two first guide mechanisms correspondingly; the driving mechanism is connected with the connecting seats, the supporting seat is erected on the two connecting seats in the transverse direction, the upper surface of the supporting seat is provided with a supporting plane, the scraper mechanism is arranged at the lower end of the supporting seat, the first powder box is arranged at the front end of the supporting seat, and the second powder box is distributed at the rear end of the supporting seat and comprises a powder storage bin and a powder guide bin. And the two second guide mechanisms are respectively arranged on the connecting seat.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a bidirectional powder spreading device for additive manufacturing equipment. Background Art

[0002] Additive manufacturing technology is an advanced manufacturing technology with distinctive features such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, fast speed, and rich and diverse material types. Since it is not limited by the complexity of the part shape and does not require any tooling, it has a very wide range of applications. As one of the additive manufacturing technologies, selective laser sintering technology has also developed very rapidly in recent years. Its main process is: the powder feeding device delivers a certain amount of powder to the workbench, the powder spreading device spreads a layer of powder material on the upper surface of the piston formed part, and the galvanometer controls the laser to scan the solid part powder layer according to the cross-sectional axis profile of the layer, so that the temperature of the powder rises to the melting point, the powder melts and sinters, and is bonded to the formed part below; when a layer of cross section is sintered, the workbench drops a layer of thickness, and the powder spreading device spreads a layer of uniform and dense powder on it, and scans and sinters a new layer of cross section, and after several layers of scanning and superposition, the entire three-dimensional solid manufacturing is completed.

[0003] Traditional powder spreading devices are mostly one-way powder spreading structures, and each time the powder is spread, it must return to the powder supply position (i.e., the powder dropping device), which takes a long time to spread the powder and is inefficient. 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 working chamber top plate, a powder dropping valve, a powder spreading device, and a working panel from top to bottom, and a forward pop-up device and a reverse pop-up device are respectively provided at the rear and 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 working chamber top plate, and holes are provided in the middle of the working chamber top plate and the powder dropping valve fixing plate, and the top of the hole is connected to the inside of the powder supply device, one end of the powder dropping valve is connected to the hole, and the other end is connected to the powder spreading device, and the powder spreading device includes a box body, a height adjustment component, and a scraper component, and the height adjustment component is located on both sides of the box body The scraper assembly is located below the box body, and the height adjustment assembly is connected to the scraper assembly; a powder dividing block is provided inside the box body, an upper powder dropping port is provided in the middle of the upper part of the box body, and 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 top 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 to the lower cover plate, and the bottom width of the powder dividing block is smaller than the width of the lower cover plate, and the front and rear ends of the lower cover plate are respectively provided with a front powder dropping port and a rear powder dropping port, the powder dropping control plate is located below the lower cover plate and is movably connected to the box body through two scraping plates, and a front powder outlet and a rear powder outlet are provided on the powder dropping control plate. When in non-working state, the front powder outlet and the front powder outlet are staggered with each other, and the rear powder outlet and the rear powder outlet are staggered with 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 misaligned slots, and the powder is then discharged. 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, the powder will easily stick together after absorbing moisture, resulting in excessive friction and causing insufficient powder output and other faults. If the gap is too large, the powder will easily fall off during the movement of the scraper, and the horizontal stability of the powder separation plate is required to be high, and the stability of the device is poor. In addition, the device generally uses a mechanical structure to evenly distribute the powder dropped from the upper powder distribution device to the front and rear of the powder distribution plate. This solution is only a theoretical distribution, and it is actually impossible to accurately control the front and rear powder input amounts. Equipment installation errors and powder jamming will easily cause inconsistent front and rear powder amounts, resulting in printing failures. Summary of the invention

[0005] Therefore, in order to solve the above-mentioned problems, the present invention provides a bidirectional powder spreading device for additive manufacturing equipment, which can accurately control the amount of powder dropped by the scraper and has good powder dropping stability.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A bidirectional powder spreading device for additive manufacturing equipment, comprising 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; 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.

[0007] 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.

[0008] 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.

[0009] Furthermore, outer edges of the lower ends of the first clamping plate and the second clamping plate are both provided with rounded corner structures.

[0010] Furthermore, the outer sides of the two side panels are provided with a powder scraper.

[0011] Furthermore, a powder guide groove is provided at the front end of the support seat.

[0012] 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.

[0013] Furthermore, powder cleaning brushes are provided at the front and rear ends of the frame.

[0014] 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.

[0015] Furthermore, there are two driving mechanisms, and the two driving mechanisms are respectively connected to two connecting seats.

[0016] By adopting the above-mentioned technical scheme, the beneficial effect of the present invention is as follows: the bidirectional powder spreading device for additive manufacturing equipment is independently arranged through the first powder box and the second powder box, and the second powder box includes a powder storage bin and a powder guide bin. When in use, the driving mechanism drives the first powder box and the second powder box on the support seat to be at the rear end and located at the lower side of the powder dropping device. At this time, the second powder outlet of the powder storage bin of the second powder box abuts against the supporting plane, that is, the second powder outlet is closed, and then the upper powder dropping device independently and quantitatively supplies powder. After the powder filling is completed, the driving mechanism drives the support seat to move to the front end along the guide direction of the first guide mechanism. At this time, the powder in the first powder box falls and is evenly spread by the scraper 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 toward the rear end along the guide direction of the second guide mechanism, so that the second powder outlet of the powder storage bin The opening is connected to the third powder inlet of the powder guide bin, and then the driving mechanism drives the support seat to move to the front end along the guiding direction of the first guide mechanism. At this time, the powder in the powder storage bin of the second powder box falls off and is evenly spread by the scraper mechanism. When the support seat is driven to the rear end, the top block abuts against the second positioning mechanism, and pushes the powder storage bin to move toward the front end along the guiding direction of the second guide mechanism. At this time, the second powder outlet of the powder storage bin of the second powder box abuts against the supporting plane, and such reciprocating movement realizes a two-way powder spreading effect. With such a design, the first powder box and the second powder box can be filled separately, and the front and rear powder spreading amounts can be controlled more accurately, which is beneficial to saving powder and controlling powder, and is helpful to change the powder spreading amount of each layer at any time when the layer thickness function is changed, so that the first powder box and the second powder box can be accurately powdered respectively, and the powder spreading stability is good. At the same time, the single scraper mechanism has a simple structure, is easy to replace, is easy to adjust, and has a low cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention in which the support seat is located at the front end of the first guide mechanism; Figure 2 is a schematic structural diagram of a support seat at the front end of a first guide mechanism in a state where one driving mechanism is omitted in an embodiment of the present invention; Figure 3 is a schematic structural diagram of a support seat at the rear end of a first guide mechanism in a state where a driving mechanism is omitted in an embodiment of the present invention; Figure 4 is a schematic diagram of a top view of the structure in which the material storage bin is located at the front end of the second guide mechanism in an embodiment of the present invention; Figure 5 is a schematic diagram of a top view of the structure of the material storage bin at the rear end of the second guide mechanism in an embodiment of the present invention; Figure 6 is a schematic diagram of the structure of the material storage bin at the rear end of the second guide mechanism in an embodiment of the present invention when viewed from above; Figure 7 is a schematic diagram of a decomposed structure in a first state in an embodiment of the present invention; Figure 8 is a schematic diagram of the decomposed structure in the second state of the embodiment of the present invention; Fig. 9 is a schematic diagram of the decomposed structure in the third state of the embodiment of the present invention; Fig.10 is a schematic diagram of the three-dimensional structure of the powder guide plate in a top view according to an embodiment of the present invention; Fig.11 is a schematic diagram of the three-dimensional structure of the powder guide plate in an upward-looking state according to an embodiment of the present invention; Fig.12 is a partial cross-sectional structural schematic diagram of an embodiment of the present invention; Fig.13 yes Fig.12 Schematic diagram of the cross-sectional structure at AA in the middle; Fig.14 It is a three-dimensional structural schematic diagram of another state of the implementation of the present invention.

[0018] Description of reference numerals: 1. Frame; 2. Driving mechanism; 3. First guide mechanism; 4. Second guide 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 scraper plate; 15. Powder filter plate; 16. Powder guide groove; 17. Powder guide plate; 18. Give way groove; 19. Powder guide surface; 20. Through groove; 30. Powder cleaning brush; 21. ball screw; 22. drive motor; 31. first guide rail; 32. first slider; 41. second guide rail; 42. second slider; 60, support plane; 71, first powder inlet; 72, first powder outlet; 81, powder storage bin; 82, powder guide bin; 83, second powder inlet; 84, second powder outlet; 85, third powder inlet; 86, third powder outlet; 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

[0019] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0020] The embodiments of the present invention are: refer to Figures 1 to 14As 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; 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. 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 .

[0021] In this embodiment, the driving mechanism 2 includes a ball screw 21 arranged on the first guide mechanism 3 and a driving motor 22 connected to one end of the ball screw 21, the first guide mechanism 3 includes a first guide rail 31 and a first slider 32 arranged on the first guide rail 31, the second guide mechanism 4 includes a second guide rail 41 and a second slider 42 arranged on the second guide rail 41, and a top block 12 is provided between the second slider 42 and the powder storage bin 81. When the support seat 6 is at the front end of the first guide mechanism 3, the front end of the top block 12 abuts against the first positioning mechanism 10; when the support seat 6 is at the rear end of the first guide mechanism 3, the rear end of the top block 12 abuts against the second positioning mechanism 11. The first positioning mechanism 10 and the second positioning mechanism 11 are both hydraulic dampers, and the driving motor 22 is a servo motor.

[0022] There are two driving mechanisms 2 mentioned above, and the two driving mechanisms 2 are respectively connected to two connecting seats 5. The transmission structure is optimized, the rigidity is greater, and the powder spreading device runs more stably. The servo system is used to drive the high-precision dust-proof ball screw 21 and the guide mechanism of the guide rail slider, so that the powder spreading system has high left-right synchronization accuracy and high two-way powder spreading consistency. There will be no phenomenon such as insufficient rigidity, tilt, left-right position deviation, etc., and it has a high dustproof level and can work stably for a long time. Of course, a driving mechanism can also be set up, which can also achieve the guiding effect, but the running stability of the powder spreading device is relatively poor.

[0023] The two-way powder spreading device for additive manufacturing equipment is independently arranged through the first powder box 7 and the second powder box 8, and the second powder box 8 includes a powder storage bin 81 and a powder guide bin 82. When in use, the driving mechanism 2 drives the first powder box 7 and the second powder box 8 on the support seat 6 to be at the rear end and located at the lower side of 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 supporting plane 60, that is, the second powder outlet 84 is closed, and then the upper powder dropping device 13 independently and quantitatively supplies powder. After the powder filling is completed, the driving mechanism 2 drives the support seat 6 to move to the front end along the guiding direction of the first guide mechanism 3. At this time, the powder in the first powder box 7 falls and is evenly spread by the scraper mechanism 9. When the support seat 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 toward the rear end along the guiding direction of the second guide mechanism 4, so that the second powder outlet 84 of the powder storage bin 81 and the powder guide bin The third powder inlet 85 of 82 is connected, and then the driving mechanism 2 drives the support seat 6 to move to the front end along the guiding direction of the first guide mechanism 3. At this time, the powder in the powder storage bin 81 of the second powder box 8 falls off and is evenly spread by the scraper mechanism 9. When the support seat 6 is driven to the rear end, the top block 12 abuts against the second positioning mechanism 11, and pushes the powder storage bin 81 to move toward the front end along the guiding direction of the second guide 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 supporting plane 60, and such reciprocating movement realizes a two-way powder spreading effect. Such a design allows the first powder box and the second powder box to be filled separately, and can more accurately control the front and rear powder spreading amount, which is beneficial to saving powder and controlling powder, and is helpful to change the powder spreading amount of each layer at any time when the layer thickness function is changed, so as to realize the first powder box 7 and the second powder box 8 respectively for accurate powder laying, and the powder laying stability is good. At the same time, the single scraper mechanism 9 has a simple structure, is easy to replace, easy to adjust, and has low cost.

[0024] At the same time, the two lateral ends of the powder storage bin 81 of the second powder box 8 are connected to the second guide mechanism 4 of the guide rail and slider structure, and cooperate with the first positioning mechanism 10 and the second positioning mechanism 11 set 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. The powder storage bin 81 only has bottom surface movement friction, with a small contact area, good operating stability and high operating safety, avoiding powder jamming problems.

[0025] 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.

[0026] 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 .

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection 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; 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 of the support seat is provided with a powder guiding groove.

7. The bidirectional powder spreading device for additive manufacturing equipment according to claim 6, characterized in that: 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 penetrated at the lower part of the powder guide surface.

8. The bidirectional powder spreading device for additive manufacturing equipment according to claim 7, characterized in that: The front end and the rear end of the frame are both provided with powder cleaning brushes.

9. The bidirectional powder spreading device for additive manufacturing equipment according to claim 7, 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.

10. The bidirectional powder spreading device for additive manufacturing equipment according to claim 7, characterized in that: There are two driving mechanisms, and the two driving mechanisms are respectively connected to two connecting seats.

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