Powder spraying device for additive manufacturing

Abstract

The invention discloses a powder spraying device for additive manufacturing, and relates to the technical field of additive manufacturing powder spraying, the powder spraying device comprises a machine body, a door plate is rotatably mounted on one side of the machine body, a powder spraying head is arranged in the machine body, a support is fixed on the inner wall of the bottom of the machine body, a placing seat is rotatably connected to the top of the support, and a plurality of clamps are arranged on the placing seat; through the design of the fixing mechanism, the hollow column is inserted into the insertion hole, the stopping plate automatically expands outwards to be inserted into the insertion groove under the action of components such as the spring and the hinged plate, and rapid installation of the clamp is completed; when the direction of the clamp is adjusted, the pressing plate is pressed to separate the inserting block from the inserting groove, the movable ring is rotated to drive the clamp to rotate to a proper position, the pressing plate is loosened, the inserting block is re-inserted into the inserting groove to be fixed under the action of the torsion spring, operation is easy, and the installation and adjustment efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of powder coating technology in additive manufacturing, and in particular to a powder coating apparatus for additive manufacturing. Background Technology

[0002] Additive manufacturing, also known as 3D printing, is a technology that uses materials to create solid parts layer by layer. Compared with traditional manufacturing technology, additive manufacturing has advantages such as the ability to form parts with complex shapes, high forming accuracy, and material saving. In the forming process, powder is first sprayed onto the forming substrate and melted with a laser or electron beam, and then gradually added until the part is completed.

[0003] However, in practical applications, some unresolved problems remain. The following are common issues with existing powder coating equipment for additive manufacturing: Before powder coating, the product base is typically placed on a worktable and secured with a clamp. The worktable has multiple threaded holes; the product base is fixed to the worktable by tightening bolts into these holes. When the clamp position needs to be adjusted, the bolts must be completely removed, the clamp moved to the new threaded hole position, and the bolts tightened again. This operation is cumbersome, requires specific tools for bolt removal and installation, lacks flexibility, and is inefficient. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing powder spraying apparatus for additive manufacturing, the present invention is proposed.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a powder spraying device for additive manufacturing, comprising: a body, a door panel rotatably mounted on one side of the body, a powder spraying head disposed inside the body, a bracket fixed to the bottom inner wall of the body, a placement seat rotatably connected to the top of the bracket, a plurality of insertion holes opened on the top of the placement seat, a plurality of clamps disposed on the placement seat, and a conveying pipe fixed to one side of the powder spraying head; a fixing mechanism, comprising a hollow column, a conical block, and a spring, through holes opened on both sides of the hollow column, the outer side of the conical block slidably connected to the inner wall of the hollow column, the bottom end of the spring fixed to the bottom inner wall of the hollow column, and the top end fixed to the bottom of the conical block, a baffle plate disposed in the through hole, rotating shafts fixed on both sides of the baffle plate, the two ends of the two rotating shafts respectively rotatably connected to the inner walls of the two sides of the through hole, the hollow column being able to be inserted into the insertion hole, and the clamps being rotatably connected to the fixing mechanism.

[0007] In a preferred embodiment of the powder spraying device for additive manufacturing described in this invention, the fixing mechanism further includes a pressing rod. A circular hole is provided on the hollow column. One end of the pressing rod is slidably connected to the inner wall of the circular hole. The bottom end of the pressing rod is fixed to the top of the conical block. Two first hinge seats are fixed to the top of the conical block. A second hinge seat is fixed to one side of each of the two abutment plates that are close to each other. A hinge plate is hinged to the first hinge seat. The other end of the hinge plate is hinged to the second hinge seat. Two insertion slots are provided on the inner wall of the insertion hole, and the abutment plate can enter the insertion slots.

[0008] In a preferred embodiment of the powder spraying device for additive manufacturing described in this invention, two fixed rings are fixedly sleeved on the hollow column, and a movable ring is movably sleeved on the hollow column. The movable ring is located between the two fixed rings, and a limiting mechanism is provided on one of the fixed rings.

[0009] As a preferred embodiment of the powder spraying device for additive manufacturing described in this invention, the limiting mechanism includes a third hinge seat, a rotating rod, and a pressing plate. The third hinge seat is fixed to one side of one of the fixed rings. The two ends of the rotating rod are rotatably connected to the inner walls of the two sides of the third hinge seat. The pressing plate is fixed on the rotating rod. An insert block is fixed to the inner side of one end of the pressing plate. The surface of the movable ring is provided with multiple slots, and one end of the insert block is inserted into the slot.

[0010] In a preferred embodiment of the powder spraying device for additive manufacturing described in this invention, a torsion spring is sleeved on the rotating rod, one end of the torsion spring is fixed to the surface of the rotating rod, and the other end is fixed to the third hinge seat.

[0011] In a preferred embodiment of the powder spraying device for additive manufacturing described in this invention, the fixture includes a connecting frame, a threaded rod, a first bearing, and a pressure plate. One end of the connecting frame is fixed to one side of a movable ring. The first bearing is fixed to the pressure plate. One end of the pressure plate is slidably connected to one side of the connecting frame. The threaded rod is threadedly connected to the connecting frame. The bottom end of the threaded rod is fixed to the inner ring of the first bearing. A knob is fixed to the top end of the threaded rod.

[0012] As a preferred embodiment of the powder spraying device for additive manufacturing described in this invention, the machine body is provided with a concave plate, a U-shaped plate is fixed to one side of the concave plate, a second motor is fixed to the inner wall of one side of the concave plate, a second lead screw is fixed to the output end of the second motor, one end of the second lead screw is rotatably connected to the inner wall of one side of the concave plate, a sliding block is slidably connected to the inner wall of one side of the concave plate, a second lead screw nut is embedded in the sliding block, the second lead screw nut is threadedly connected to the second lead screw, a movable hole is opened at one end of the sliding block, the outer side of the U-shaped plate is slidably connected to the inner wall of the movable hole, a cylinder is fixed to one side of the sliding block, an L-shaped frame is fixed to the telescopic part of the cylinder, and the powder spraying head is fixed to the L-shaped frame.

[0013] In a preferred embodiment of the powder spraying device for additive manufacturing described in this invention, a second L-plate is fixed to the top inner wall of the machine body, a first lead screw is rotatably mounted on one side inner wall of the second L-plate, a first motor is fixed to one side of the machine body, the output end of the first motor passes through one side of the machine body and is fixed to the other end of the first lead screw, a connecting plate is slidably connected to the bottom of the second L-plate, a first lead screw nut is embedded in one side of the connecting plate, the first lead screw nut is threadedly connected to the first lead screw, and the bottom of the connecting plate is fixed to the top of the concave plate.

[0014] As a preferred embodiment of the powder spraying device for additive manufacturing described in this invention, the inner walls of both sides of the machine body are fixed with a first L-plate, a rod is fixed to one inner wall of the first L-plate, one end of the rod is fixed to one inner wall of the machine body, and the two ends of the connecting plate are respectively movably sleeved on the two rods.

[0015] In a preferred embodiment of the powder spraying device for additive manufacturing described in this invention, a third motor for driving the placement seat to rotate is fixed to the top inner wall of the bracket, and the output end of the third motor passes through the top of the bracket and is fixed to the bottom of the placement seat.

[0016] The beneficial effects of this invention are as follows: Through the design of the fixing mechanism, the hollow column is inserted into the insertion hole, and the baffle plate automatically expands outward and inserts into the insertion slot under the action of components such as the spring and the hinge plate, thus completing the quick installation of the clamp; when adjusting the direction of the clamp, pressing the pressing plate causes the insert to disengage from the slot, rotating the movable ring drives the clamp to rotate to the appropriate position, releasing the pressing plate, and the insert is reinserted into the slot and fixed under the action of the torsion spring. The operation is simple and greatly improves the efficiency of installation and adjustment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the present invention without the door panel installed.

[0020] Figure 3 This is a schematic diagram of the structure of the bracket and other components of the present invention.

[0021] Figure 4 This is a schematic diagram of the fixture, fixing mechanism, and limiting mechanism of the present invention.

[0022] Figure 5 This is a cross-sectional view of the fixing mechanism of the present invention.

[0023] Figure 6 This is a schematic diagram of the limiting mechanism of the present invention.

[0024] Figure 7 This is a schematic diagram of the structure of the first motor, powder spraying head, and other components of the present invention.

[0025] Figure 8 This is a schematic diagram of the insertion hole and insertion groove of the present invention.

[0026] In the diagram: 1. Body; 11. Door panel; 12. Bracket; 13. Placement seat; 14. Insertion hole; 141. Insertion slot; 15. First L-plate; 16. Second L-plate; 161. First motor; 162. First lead screw; 163. Connecting plate; 17. Concave plate; 171. U-shaped plate; 172. Second lead screw; 173. Cylinder; 2. Fixture; 21. Connecting frame; 22. Pressure plate; 23. Threaded rod; 24. First bearing; 3. Powder spraying head; 4. Fixing mechanism; 41. Hollow column; 42. Baffle plate; 43. Pressing rod; 44. Spring; 45. Conical block; 46. Through hole; 47. Hinge plate; 5. Fixed ring; 51. Moving ring; 6. Limiting mechanism; 61. Pressing plate; 62. Rotating rod; 63. Third hinge seat; 64. Slot. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1, referring to Figures 1-5 This is the first embodiment of the present invention. This embodiment provides a powder spraying device for additive manufacturing, including a body 1. A door panel 11 is installed on one side of the body 1 via a hinge. A powder spraying head 3 is provided inside the body 1. A bracket 12 is fixed to the bottom inner wall of the body 1. A placement seat 13 is rotatably connected to the top of the bracket 12. A plurality of clamps 2 are provided on the placement seat 13. A conveying pipe is fixed to one side of the powder spraying head 3.

[0031] The fixing mechanism 4 includes a hollow column 41, a conical block 45, and a spring 44. The hollow column 41 has through holes 46 on both sides. The outer side of the conical block 45 is slidably connected to the inner wall of the hollow column 41. The bottom end of the spring 44 is fixed to the bottom inner wall of the hollow column 41, and the top end is fixed to the bottom of the conical block 45. A baffle plate 42 is provided in the through hole 46. A rotating shaft is fixed on both sides of the baffle plate 42. The two ends of the two rotating shafts are rotatably connected to the inner walls of the two sides of the through hole 46, respectively.

[0032] The fixing mechanism 4 also includes a pressing rod 43. A round hole is provided on the hollow column 41. One end of the pressing rod 43 is slidably connected to the inner wall of the round hole. The bottom end of the pressing rod 43 is fixed to the top of the conical block 45. Two first hinge seats are fixed to the top of the conical block 45. A second hinge seat is fixed on the side of the two abutment plates 42 that are close to each other. A hinge plate 47 is hinged to the first hinge seat. The other end of the hinge plate 47 is hinged to the second hinge seat. A plurality of insertion holes 14 are provided on the top of the placement seat 13. The hollow column 41 is inserted into the insertion hole 14. Two insertion grooves 141 are provided on the inner wall of the insertion hole 14. The abutment plate 42 can enter the insertion groove 141.

[0033] By designing the fixing mechanism 4, the hollow column 41 is inserted into the insertion hole 14, and the baffle plate 42 automatically expands outward and inserts into the insertion slot 141 under the action of components such as the spring 44 and the hinge plate 47, thus completing the quick installation of the clamp 2.

[0034] Example 2, refer to Figures 1-8 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0035] Specifically, two fixed rings 5 ​​are fixedly fitted on the hollow column 41, and a movable ring 51 is movably fitted on the hollow column 41, with the movable ring 51 located between the two fixed rings 5. One of the fixed rings 5 ​​is equipped with a limiting mechanism 6. The clamp 2 is fixedly connected to the movable ring 51.

[0036] The clamp 2 can be rotated by hand, which will cause the movable ring 51 to rotate on the hollow column 41, thereby causing the clamp 2 to rotate as a whole and adjust its direction.

[0037] Specifically, the limiting mechanism 6 includes a third hinge seat 63, a rotating rod 62, and a pressing plate 61. The third hinge seat 63 is fixed to one side of one of the fixed rings 5. The two ends of the rotating rod 62 are rotatably connected to the inner walls of the two sides of the third hinge seat 63, respectively. The pressing plate 61 is fixed on the rotating rod 62. A plug is fixed on the inner side of one end of the pressing plate 61. Multiple slots 64 are opened on the surface of the movable ring 51. One end of the plug is inserted into the slot 64.

[0038] A torsion spring is fitted on the rotating rod 62. One end of the torsion spring is fixed to the surface of the rotating rod 62, and the other end is fixed to the third hinge seat 63.

[0039] If the direction of the clamp 2 needs to be adjusted, press the end of the pressing plate 61 away from the insert. The pressing plate 61 rotates in the third hinge seat 63 via the rotating rod 62. The insert fixed on the inner side of one end of the pressing plate 61 will disengage from the slot 64 on the surface of the movable ring 51. At this time, the clamp 2 can be rotated by hand. The clamp 2 drives the movable ring 51 to rotate on the hollow column 41. After rotating to the appropriate position, the insert is aligned with the slot 64. Release the pressing plate 61. Under the action of the torsion spring, the rotating rod 62 will drive the pressing plate 61 to reset, so that the insert is re-inserted into the corresponding slot 64, thereby fixing the movable ring 51 on the hollow column 41. After the position of the movable ring 51 is adjusted, the position of the clamp 2 connected to it will also change accordingly. It can be used to fix workpiece parts of different positions or shapes.

[0040] Specifically, the fixture 2 includes a connecting frame 21, a threaded rod 23, a first bearing 24, and a pressure plate 22. One end of the connecting frame 21 is fixed to one side of the movable ring 51. The first bearing 24 is fixed on the pressure plate 22. One end of the pressure plate 22 is slidably connected to one side of the connecting frame 21. The threaded rod 23 is threadedly connected to the connecting frame 21. The bottom end of the threaded rod 23 is fixed to the inner ring of the first bearing 24. The part where the threaded rod 23 connects to the first bearing 24 is a smooth cylinder without threads. A knob is fixed to the top of the threaded rod 23.

[0041] Turn the knob, and the knob will drive the threaded rod 23, which will drive the pressure plate 22 to move downward, clamping and fixing the product base.

[0042] Specifically, the machine body 1 has a concave plate 17 inside, a U-shaped plate 171 is fixed to one side of the concave plate 17, a second motor is fixed to the inner wall of one side of the concave plate 17, a second lead screw 172 is fixed to the output end of the second motor, one end of the second lead screw 172 is rotatably connected to the inner wall of one side of the concave plate 17 through a bearing, a sliding block is slidably connected to the inner wall of one side of the concave plate 17, a second lead screw nut is embedded in the sliding block, and the second lead screw nut is threadedly connected to the second lead screw 172. A movable hole is opened at one end of the sliding block, the outer side of the U-shaped plate 171 is slidably connected to the inner wall of the movable hole, a cylinder 173 is fixed to one side of the sliding block, an L-shaped frame is fixed to the telescopic part of the cylinder 173, and the powder spraying head 3 is fixed to the L-shaped frame.

[0043] The second motor is started, and the output end of the second motor drives the second lead screw 172 to rotate. The second lead screw 172 drives the sliding block to move. The sliding block will move along the length direction of the second lead screw 172. The movable hole at one end of the sliding block is slidably connected to the outside of the U-shaped plate 171 to ensure the stability of the movement of the sliding block. The movement of the sliding block drives the cylinder 173, the L-shaped frame, and the powder spraying head 3 to move, thereby adjusting the position of the powder spraying head 3.

[0044] Specifically, a second L-plate 16 is fixed to the inner top wall of the machine body 1. A first lead screw 162 is rotatably mounted on one side of the inner wall of the second L-plate 16 via a bearing. A first motor 161 is fixed to one side of the machine body 1. The output end of the first motor 161 passes through one side of the machine body 1 and is fixed to the other end of the first lead screw 162. A connecting plate 163 is slidably connected to the bottom of the second L-plate 16. A first lead screw nut is embedded in one side of the connecting plate 163. The first lead screw nut is threadedly connected to the first lead screw 162. The bottom of the connecting plate 163 is fixed to the top of the concave plate 17. The first lead screw 162 is perpendicular to the second lead screw 172.

[0045] The first motor 161 is started, and the output end of the first motor 161 drives the first lead screw 162 to rotate. The first lead screw 162 drives the connecting plate 163 to move. The connecting plate 163 will move along the length direction of the first lead screw 162. At the same time, the rods on the first L plate 15 fixed on the inner walls of both sides of the machine body 1 guide the two ends of the connecting plate 163 to ensure that the connecting plate 163 moves smoothly. The movement of the connecting plate 163 drives the concave plate 17, U-shaped plate 171, cylinder 173, powder spraying head 3 and other components to move in the horizontal direction, thereby adjusting the position of the powder spraying head 3 in the horizontal direction.

[0046] Specifically, the inner walls on both sides of the body 1 are fixed with a first L plate 15, and a rod is fixed to one side of the inner wall of the first L plate 15. One end of the rod is fixed to one side of the inner wall of the body 1, and the two ends of the connecting plate 163 are respectively movably sleeved on the two rods.

[0047] The inner walls of both sides of the body 1 are fixed with a first L plate 15. A rod is fixed to one side of the inner wall of the first L plate 15. One end of the rod is fixed to one side of the inner wall of the body 1. The two ends of the connecting plate 163 are respectively movably sleeved on the two rods. The rod on the first L plate 15 plays a guiding role for the two ends of the connecting plate 163, ensuring that the connecting plate 163 moves smoothly.

[0048] Specifically, a third motor for driving the placement seat 13 to rotate is fixed on the top inner wall of the bracket 12. The output end of the third motor passes through the top of the bracket 12 and is fixed to the bottom of the placement seat 13.

[0049] The third motor fixed to the inner wall of the top of the start bracket 12 is activated. The output end of the third motor drives the placement seat 13 to rotate, thereby causing the base fixed on the placement seat 13 to rotate.

[0050] The first motor 161, the second motor, and the cylinder 173 are existing technologies. The working principle of this part is also existing technology, which can be clearly understood by those skilled in the art, and will not be described in detail here.

[0051] During use, depending on the size of the product base, the hollow column 41 is inserted into the insertion hole 14 at the outer edge of the product base (and the baffle plate 42 is aligned with the insertion groove 141 in the insertion hole 14). During the insertion process, the baffle plate 42 contacts the insertion hole 14, and the inner wall of the insertion hole 14 presses against the baffle plate 42. The movement of the baffle plate 42 drives the movement of the hinge plate 47 and the conical block 45, causing the conical block 45 to move downward and the spring 44 to compress. When the baffle plate 42 contacts the insertion groove 141, the compressed spring 44 is released, pushing the conical block 45 upward. At the same time, the baffle plate 42 is extended outward through the hinge plate 47, so that the top of the baffle plate 42 is inserted into the insertion groove 141 for contact, thus completing the installation of the clamp 2.

[0052] Place the product base on the placement seat 13. If the direction of the clamp 2 needs to be adjusted, press one end of the pressing plate 61. The pressing plate 61 rotates in the third hinge seat 63 via the rotating rod 62. The insert fixed on the inner side of one end of the pressing plate 61 will disengage from the slot 64 on the surface of the movable ring 51. At this time, the connecting frame 21 can be rotated by hand. The connecting frame 21 drives the movable ring 51 to rotate on the hollow column 41. After rotating to the appropriate position, the insert is aligned with the slot 64. Release the pressing plate 61. Under the action of the torsion spring, the rotating rod 62 will drive the pressing plate 61 to reset, so that the insert is re-inserted into the corresponding slot 64, and the movable ring 51 is fixed on the hollow column 41. After the position of the movable ring 51 is adjusted, the position of the clamp 2 connected to it will also change accordingly. It can be used to fix product bases of different positions or shapes.

[0053] Rotate the knob, which drives the threaded rod 23. The threaded rod 23 drives the pressure plate 22 to move downward, and the pressure plate 22 presses down to fix the product base.

[0054] The first motor 161 is started, and the output end of the first motor 161 drives the first lead screw 162 to rotate. The first lead screw 162 drives the connecting plate 163 to move. The connecting plate 163 will move along the length direction of the first lead screw 162. At the same time, the rods on the first L plate 15 fixed on the inner walls of both sides of the machine body 1 guide the two ends of the connecting plate 163 to ensure that the connecting plate 163 moves smoothly. The movement of the connecting plate 163 drives the concave plate 17, U-shaped plate 171, cylinder 173, powder spraying head 3 and other components to move in the horizontal direction, thereby adjusting the position of the powder spraying head 3 in the horizontal direction.

[0055] The second motor is started, and the output end of the second motor drives the second lead screw 172 to rotate. The second lead screw 172 drives the sliding block to move. The sliding block will move along the length direction of the second lead screw 172. The movable hole at one end of the sliding block is slidably connected to the outside of the U-shaped plate 171 to ensure the stability of the movement of the sliding block. The movement of the sliding block drives the cylinder 173, the L-shaped frame, and the powder spraying head 3 to move accordingly, thereby adjusting the position of the powder spraying head 3.

[0056] The conveying pipe delivers the powder spraying material to the powder spraying head 3 (the conveying pipe is connected to an external conveying pipeline). The powder spraying head 3 begins to spray powder onto the product base fixed on the placement seat 13. If the product base needs to rotate during the powder spraying process, the third motor fixed on the inner wall of the top of the bracket 12 can be started. The output end of the third motor drives the placement seat 13 to rotate, thereby causing the product base fixed on the placement seat 13 to rotate.

[0057] When the position of clamp 2 needs to be adjusted, press the pressing rod 43 by hand. The pressing rod 43 moves downward, which in turn drives the conical block 45 to move downward. Through the action of the hinge plate 47, the stop plate 42 moves inward, causing the stop plate 42 to rotate into the hollow column 41 (at this time, the stop plate 42 leaves the insertion slot 141). Then, pull the hollow column 41 upward to leave the current insertion hole 14.

[0058] The thread of the threaded rod 23 is a single-start thread (the thread helix angle is less than or equal to the equivalent friction angle, and it has self-locking properties). The material specifications of the threaded rod 23, torsion spring, and spring 44 can be selected according to actual needs. The type and material specifications of the first lead screw 162 and the second lead screw 172 can be selected according to actual needs.

[0059] The first motor 161 and the second motor can be either stepper motors or servo motors. The specific type can be selected according to actual needs. It should be noted that the first motor 161, the second motor, and the cylinder 173 need to be controlled by an external controller (such as a PLC controller) during use.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A powder spraying device for additive manufacturing, characterized in that: include: The machine body (1) has a door panel (11) rotatably installed on one side of the machine body (1), a powder spraying head (3) is provided inside the machine body (1), a bracket (12) is fixed on the bottom inner wall of the machine body (1), a placement seat (13) is rotatably connected to the top of the bracket (12), a plurality of insertion holes (14) are opened on the top of the placement seat (13), a plurality of clamps (2) are provided on the placement seat (13), and a conveying pipe is fixed on one side of the powder spraying head (3). The fixing mechanism (4) includes a hollow column (41), a conical block (45) and a spring (44). Both sides of the hollow column (41) are provided with through holes (46). The outer side of the conical block (45) is slidably connected to the inner wall of the hollow column (41). The bottom end of the spring (44) is fixed to the bottom inner wall of the hollow column (41), and the top end is fixed to the bottom of the conical block (45). A baffle plate (42) is provided in the through hole (46). Both sides of the baffle plate (42) are fixed with rotating shafts. The two ends of the two rotating shafts are rotatably connected to the inner walls of the two sides of the through hole (46). The hollow column (41) can be inserted into the insertion hole (14). The clamp (2) is rotatably connected to the fixing mechanism (4).

2. The powder spraying device for additive manufacturing as described in claim 1, characterized in that: The fixing mechanism (4) also includes a pressing rod (43). A circular hole is provided on the hollow column (41). One end of the pressing rod (43) is slidably connected to the inner wall of the circular hole. The bottom end of the pressing rod (43) is fixed to the top of the conical block (45). Two first hinge seats are fixed to the top of the conical block (45). Two second hinge seats are fixed on the side of the two baffles (42) that are close to each other. A hinge plate (47) is hinged to the first hinge seat. The other end of the hinge plate (47) is hinged to the second hinge seat. Two insertion slots (141) are provided on the inner wall of the insertion hole (14). The baffle (42) can enter the insertion slot (141).

3. The powder spraying device for additive manufacturing as described in claim 2, characterized in that: Two fixed rings (5) are fixedly sleeved on the hollow column (41), and a movable ring (51) is movably sleeved on the hollow column (41). The movable ring (51) is located between the two fixed rings (5), and a limiting mechanism (6) is provided on one of the fixed rings (5).

4. The powder spraying device for additive manufacturing as described in claim 3, characterized in that: The limiting mechanism (6) includes a third hinge seat (63), a rotating rod (62), and a pressing plate (61). The third hinge seat (63) is fixed to one side of one of the fixed rings (5). The two ends of the rotating rod (62) are rotatably connected to the inner walls of the two sides of the third hinge seat (63). The pressing plate (61) is fixed on the rotating rod (62). A plug is fixed on the inner side of one end of the pressing plate (61). Multiple slots (64) are opened on the surface of the movable ring (51). One end of the plug is inserted into the slot (64).

5. The powder spraying apparatus for additive manufacturing as described in claim 4, characterized in that: A torsion spring is fitted on the rotating rod (62), one end of which is fixed to the surface of the rotating rod (62), and the other end is fixed to the third hinge seat (63).

6. The powder spraying apparatus for additive manufacturing as described in claim 5, characterized in that: The clamp (2) includes a connecting frame (21), a threaded rod (23), a first bearing (24), and a pressure plate (22). One end of the connecting frame (21) is fixed to one side of the movable ring (51). The first bearing (24) is fixed on the pressure plate (22). One end of the pressure plate (22) is slidably connected to one side of the connecting frame (21). The threaded rod (23) is threadedly connected to the connecting frame (21). The bottom end of the threaded rod (23) is fixed to the inner ring of the first bearing (24). A knob is fixed to the top end of the threaded rod (23).

7. The powder spraying apparatus for additive manufacturing as described in claim 1, characterized in that: The machine body (1) is provided with a concave plate (17). A U-shaped plate (171) is fixed on one side of the concave plate (17). A second motor is fixed on the inner wall of one side of the concave plate (17). A second lead screw (172) is fixed at the output end of the second motor. One end of the second lead screw (172) is rotatably connected to the inner wall of one side of the concave plate (17). A sliding block is slidably connected to the inner wall of one side of the concave plate (17). A second lead screw nut is embedded in the sliding block. The second lead screw nut is threadedly connected to the second lead screw (172). A movable hole is opened at one end of the sliding block. The outer side of the U-shaped plate (171) is slidably connected to the inner wall of the movable hole. A cylinder (173) is fixed on one side of the sliding block. An L-shaped frame is fixed to the telescopic part of the cylinder (173). The powder spraying head (3) is fixed on the L-shaped frame.

8. The powder spraying apparatus for additive manufacturing as described in claim 7, characterized in that: The top inner wall of the machine body (1) is fixed with a second L plate (16), and a first lead screw (162) is rotatably provided on one side inner wall of the second L plate (16). A first motor (161) is fixed on one side of the machine body (1). The output end of the first motor (161) passes through one side of the machine body (1) and is fixed to the other end of the first lead screw (162). A connecting plate (163) is slidably connected to the bottom of the second L plate (16). A first lead screw nut is embedded in one side of the connecting plate (163). The first lead screw nut is threadedly connected to the first lead screw (162). The bottom of the connecting plate (163) is fixed to the top of the concave plate (17).

9. The powder spraying apparatus for additive manufacturing as described in claim 8, characterized in that: The inner walls of both sides of the body (1) are fixed with a first L plate (15), and a rod is fixed on one side of the inner wall of the first L plate (15). One end of the rod is fixed to one side of the inner wall of the body (1), and the two ends of the connecting plate (163) are respectively movably sleeved on the two rods.

10. The powder spraying apparatus for additive manufacturing as described in claim 1, characterized in that: The top inner wall of the bracket (12) is fixed with a third motor for driving the placement seat (13) to rotate. The output end of the third motor passes through the top of the bracket (12) and is fixed to the bottom of the placement seat (13).

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