Cascade type broadband powder feeding assembly of coaxial broadband powder feeding device

Abstract

The present invention provides a cascaded broadband powder feeding assembly of a coaxial broadband powder feeding device, comprising a powder feeder body, a cover plate, a quartz tube, a powder feeding block and a cascade powder distribution assembly. The powder feeding block and the cascade powder distribution assembly are fixed on the top of the powder feeder body in sequence. A flat rectangular groove is provided in the powder feeder body, and a plurality of quartz tubes are placed in parallel and arranged therein. The inlet end of the quartz tube faces the cascade powder distribution assembly, and the outlet end faces the lower end of the nozzle body; the cascade powder distribution assembly comprises a powder distribution block with powder distribution holes and a sealing gasket arranged between the powder distribution blocks of two adjacent layers, the powder distribution holes of the powder distribution blocks of the two adjacent layers are staggered layer by layer, and the number of powder distribution holes of the powder distribution blocks of the bottom layer is consistent with that of the quartz tubes. After the powder passes through the powder feeding block in sequence and enters the cascade powder distribution assembly for powder distribution, it is sent into a plurality of quartz tubes and then sent to the molten pool below. Therefore, the combination selection and debugging of powder distribution can be quickly carried out according to needs, and the powder distribution and powder feeding scheme can be quickly determined.

Description

[0001] This application is a divisional application of the invention patent application filed by the applicant on October 29, 2021 with application number 2021112677323 and titled Coaxial Wide Band Powder Feeding Device for Laser Cladding Additive Manufacturing. Technical Field

[0002] The present invention relates to the technical field of laser cladding additive manufacturing, in particular to a coaxial broadband powder feeding technology, and in particular to a cascade broadband powder feeding component of a coaxial broadband powder feeding device. Background Art

[0003] As an emerging surface strengthening technology, laser additive manufacturing technology has a wide range of industrial applications and fields. It is used in mining machinery, coal, petrochemical, railway, automobile, shipbuilding, metallurgy, aviation, machine tools and other fields. The use of laser additive manufacturing and remanufacturing technology can be used to quickly form complex parts and repair defects, restore performance, with low cost and high efficiency. In some application fields, broadband laser cladding technology can be used to repair and strengthen the surface of remanufactured parts, achieve high strength, wear resistance, and erosion resistance, and use laser cladding processing technology for repair and performance optimization.

[0004] Broadband laser cladding processing technology uses a rectangular laser spot or an elliptical laser spot with a larger area to laser clad the powder. The powder feeding nozzle uses broadband powder feeding, so that the powder spot fed into the substrate is no longer a circular powder spot, but presents a large area of ​​approximately rectangular. It has the characteristics of short processing time and high work efficiency. In particular, the coaxial powder feeding laser cladding processing technology has the characteristics of good cladding surface quality and a wide range of applications. It has a wide range of applications in the repair and strengthening of part surfaces. However, during long-term use, due to the scouring of the nozzle powder flow channel by metal powder, the internal finish of the nozzle gradually decreases, thereby affecting the powder feeding effect, reducing the powder utilization rate, and the cladding effect is also reduced. During the repair and maintenance process, the entire powder feeding nozzle needs to be replaced, which greatly increases the replacement cost and difficulty. Moreover, long-term use will cause a lot of heat conduction to the powder feeding nozzle, and the reflection of the laser on the workpiece will also damage the pipeline on the nozzle, seriously affecting the use effect.

[0005] In the prior art, a broadband coaxial laser cladding powder feeding nozzle is proposed, such as the fully water-cooled high-power broadband coaxial laser cladding nozzle proposed in the publication number CN211227345U, which is designed with a powder separation module assembly, which divides the powder entering the powder feeding port into multiple paths, so that the powder entering the powder feeding nozzle becomes a wide powder belt, which can form a wider repair belt on the surface of the substrate after converging and melting with the laser, greatly increasing the efficiency of laser cladding repair, saving production time and improving production efficiency, and solving the problems of small powder feeding amount, small powder feeding area and slow processing efficiency of ordinary laser cladding nozzles. In particular, by setting a horizontal water tank on the powder separation module and a longitudinal water tank on the water-cooled side plate, a full-range water cooling structure is formed inside the entire laser cladding nozzle, which can meet the requirements of full water cooling during laser cladding processing and ensure the needs of long-term laser cladding processing. However, in this design, due to the fixed design of the powder delivery structure and the powder distribution structure, and the flat fixed 1-3 (1-N) structure formed in the powder distribution module assembly, the powder distribution is fixed during the powder distribution and powder delivery process and cannot be adjusted according to needs or processes. It is also not easy to adjust and debug, and it is easy to cause blockage. Once damaged or blocked, the entire powder delivery nozzle assembly needs to be replaced. At the same time, during use, the powder delivery nozzle of this design is easily damaged by the reflection of the laser on the workpiece, which causes damage to the pipeline on the nozzle, affecting the use effect.

[0006] Prior art literature:

[0007] Patented technology 1: CN211227345U A fully water-cooled high-power broadband coaxial laser cladding nozzle

[0008] Patented technology 2: CN203878217U A laser cladding head with a fully water-cooled powder nozzle Summary of the invention

[0009] The present invention aims to provide a cascaded broadband powder feeding assembly of a coaxial broadband powder feeding device, which can quickly select and debug powder separation combinations according to needs and quickly determine powder separation and powder feeding plans.

[0010] According to a first aspect of the present invention, a cascaded broadband powder feeding assembly of a coaxial broadband powder feeding device is provided, wherein the broadband powder feeding assembly comprises a powder feeder body, a cover plate, a quartz tube, a powder feeding block and a cascade powder separation assembly;

[0011] The powder feeding block and the cascade powder distribution assembly are fixed in sequence on the top of the powder feeder body;

[0012] The powder feeding block is arranged to be connected to the powder feeding pipe located on the same side of the coaxial wide-band powder feeding device to receive the conveyed powder; the powder feeding block has through holes communicating with the powder feeding pipe, and the number of through holes is N0;

[0013] The powder feeder body is provided with a flat rectangular groove and a water cooling assembly for cooling the powder feeder body, a plurality of quartz tubes are arranged in parallel in the rectangular groove to form a flat arrangement plane and are covered and sealed by the cover plate, the inlet ends of the plurality of quartz tubes face the cascade powder distribution assembly, and the outlet ends face the lower end of the nozzle body of the coaxial broadband powder feeding device;

[0014] After the powder feeding block receives the powder, the powder enters the cascade powder separation assembly, is separated by the cascade powder separation assembly, and is then fed into a plurality of quartz tubes in the powder feeder body, and is then fed into the molten pool below the nozzle body through the quartz tubes;

[0015] Among them, the cascade powder separation component includes a powder separation block with powder separation holes and a sealing gasket arranged between two adjacent layers of powder separation blocks. The powder separation holes of the two adjacent layers of powder separation blocks are staggered layer by layer, and the number of powder separation holes of the powder separation block in the bottom layer is consistent with that of the quartz tubes.

[0016] Therefore, after the powder is transported into the powder feeding block through the powder feeding pipe, it enters the cascade powder separation component, and the powder separation holes that are staggered and arranged layer by layer are used to achieve multi-layer staggered uniform and rapid powder separation, thereby realizing broadband powder feeding.

[0017] In a preferred embodiment, the powder separation holes arranged on each layer of the powder separation blocks of the cascade powder separation assembly adopt a double-layer design of a flat countersunk hole and an oblique cone-shaped powder outlet hole. The flat countersunk hole is located above the oblique cone-shaped powder outlet hole. The aperture of the flat countersunk hole is larger than the aperture of the outlet end of the oblique cone-shaped powder outlet hole. The upper part of the oblique cone-shaped powder outlet hole is connected to the lower edge of the flat countersunk hole, and a powder falling design is formed in a slope at a set angle from the lower edge of the flat countersunk hole to the outlet end of the powder outlet hole.

[0018] Therefore, when the powder is separated in staggered layers in the cascade powder separation assembly, the two adjacent layers of powder separation blocks can be seamlessly connected, and when the powder falls into the powder separation holes of the powder separation blocks in the lower layer, the countersunk holes can be connected and the powder can slide smoothly through the oblique cone-shaped powder outlet holes, and fall smoothly from the outlet end into the powder separation blocks in the next layer, reducing the risk of accumulation.

[0019] As a preferred embodiment, the powder distributing holes provided on each layer of the powder distributing blocks of the cascade powder distributing assembly are arranged to meet the following requirements:

[0020] The number of powder separation holes of the first layer of powder separation blocks is N1, N1>N0, the flat countersunk holes between the N1 powder separation holes are connected in series side by side, and the adjacent powder separation holes are directly connected in the horizontal direction and have a frameless design; and the centers of the connection positions of the adjacent flat countersunk holes of the first layer of powder separation blocks are aligned with the centers of the circles of the corresponding through holes on the powder separation blocks, and the length of the adjacent flat countersunk holes after cascading is greater than the size length of the edge connection line of the N0 through holes on the powder feeding block in the horizontal direction;

[0021] The number of powder separation holes in the middle layer powder separation block is N i , N i Indicates the number of powder separation holes in the i-th layer, N i >N i-1 ; i≤m, m is the total number of powder blocks; N i The flat countersunk holes of the powder separation holes are connected in series side by side, and the adjacent powder separation holes are directly connected in the horizontal direction and have a frameless design; the center of the connection position of the adjacent flat countersunk holes of the i-th layer of powder separation blocks is aligned with the center of the outlet end of the corresponding oblique cone-shaped powder outlet hole on the i-1th layer, and the length of the adjacent flat countersunk holes after cascading is greater than the size length of the edge connection line of the powder outlet of the Ni-1 powder outlet holes in the i-1th layer in the horizontal direction;

[0022] The length of the flat countersunk holes of the powder separation holes arranged on the next layer of powder separation blocks after cascading is greater than the length of the edge connection line of the outlet ends of the powder outlet holes of the previous layer of powder separation blocks after cascading.

[0023] Therefore, in the staggered powder separation process, the staggered design and size matching of the powder separation holes of the powder separation blocks can not only ensure a smooth transition between the upper and lower layers of powder separation blocks, but also achieve smooth powder falling between the upper and lower layers of powder separation blocks, thereby avoiding powder accumulation or blockage inside.

[0024] Preferably, the powder distributing holes provided on each layer of the powder distributing blocks of the cascade powder distributing assembly meet the following requirements:

[0025] The diameter of the flat countersunk holes of the powder separation holes of each layer of powder separation blocks is smaller than the diameter of the flat countersunk holes of the powder separation holes of the previous layer of powder separation blocks, and decreases layer by layer;

[0026] The aperture of the outlet end of the powder outlet hole of each layer of powder distribution blocks is smaller than the aperture of the outlet end of the powder outlet hole of the previous layer of powder distribution blocks, and decreases layer by layer.

[0027] Preferably, a rectangular through hole is provided on the sealing gasket between the two adjacent layers of powder distribution blocks, and the edge of the rectangular through hole exceeds the edge of the powder distribution holes provided on the two adjacent layers of powder distribution blocks connected thereto.

[0028] Therefore, by setting the gaskets between the powder dividing blocks, on the one hand, the sealing gasket is used to prevent the powder from leaking out, and on the other hand, the powder can be smoothly dropped between the powder dividing blocks of adjacent layers.

[0029] In an optional embodiment, the center position of the connecting line between any two adjacent flat countersunk holes is located at the position where the centers of the flat countersunk holes and the oblique cone powder outlet holes of the previous layer of powder separation blocks overlap, so that the powder of the previous layer falls evenly and can be respectively distributed to the oblique cone powder outlet holes of the next layer, and then fall into the powder separation blocks of the next layer.

[0030] The cascaded broadband powder feeding assembly of the coaxial broadband powder feeding device proposed in the present invention can quickly select and debug the powder separation combination according to needs, and quickly determine the powder separation and powder feeding schemes; at the same time, it can reduce the wear of the powder on the nozzle during use. When the quartz tube used for powder feeding is worn, it only needs to be replaced without replacing the rest of the nozzle, thereby greatly reducing the replacement cost, making it easy to replace the powder feeding nozzle after it is worn, reducing the replacement cost, and at the same time having good cooling effect and anti-reflection effect, and can be used stably for a long time.

[0031] It should be understood that all combinations of the aforementioned concepts and the additional concepts described in more detail below can be considered as part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent. In addition, all combinations of the claimed subject matter are considered as part of the inventive subject matter of the present disclosure.

[0032] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0034] Figure 1 It is a schematic structural diagram of a coaxial broadband powder feeding device for laser cladding additive manufacturing according to an exemplary embodiment of the present invention.

[0035] Figure 2 yes Figure 1 A top view of a coaxial wide band powder feeding device for laser cladding additive manufacturing according to an embodiment.

[0036] Figure 3A-3B yes Figure 1 Schematic diagram of the exploded structure of a coaxial broadband powder feeding device for laser cladding additive manufacturing according to an embodiment.

[0037] Figure 4A-4B yes Figure 1 Schematic diagram of a broadband powder feeding assembly of a coaxial broadband powder feeding device for laser cladding additive manufacturing in an embodiment.

[0038] Figure 5 yes Figure 1 A schematic diagram of a powder distribution block of a cascade powder distribution assembly of a broadband powder feeding assembly of a coaxial broadband powder feeding device for laser cladding additive manufacturing in an embodiment.

[0039] Figure 6 yes Figure 1 A schematic diagram of a first-level powder distribution block of a cascade powder distribution assembly of a broadband powder feeding assembly of a coaxial broadband powder feeding device for laser cladding additive manufacturing in an embodiment.

[0040] Figure 7 yes Figure 1 A top view of the combination of the first-stage powder distribution block and the second-stage powder distribution block of the cascade powder distribution assembly of the broadband powder feeding assembly of the coaxial broadband powder feeding device for laser cladding additive manufacturing in the embodiment. DETAILED DESCRIPTION

[0041] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0042] Various aspects of the present invention are described in this disclosure with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily intended to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed by the present invention are not limited to any implementation. In addition, some aspects disclosed by the present invention can be used alone or in any appropriate combination with other aspects disclosed by the present invention.

[0043] Combined with Figure 1-7 The coaxial wide-band powder feeding device for laser cladding additive manufacturing of the exemplary embodiment shown includes a nozzle body 10 , a Z-axis adjustment assembly 20 , a straight-mouth connection assembly 30 , a first water-cooling assembly 40 , a baffle 50 , and a wide-band powder feeding assembly 60 .

[0044] like Figure 1 , 2 As shown, the Z-axis adjustment assembly 20 is designed to be connected with other components of the laser cladding additive manufacturing system, such as a laser assembly for additive manufacturing.

[0045] Combination Figure 1 The upper end of the Z-axis adjustment component 20 has an annular positioning portion for guiding the connection to the laser component for installation and fixation. The interior of the Z-axis adjustment component 20 is designed as a hollow structure, and a first cavity 21 along the Z-axis direction is formed therein. The laser component can emit a broadband laser beam passing through the first cavity along the Z-axis direction for broadband cladding.

[0046] The straight connection assembly 30 serves as an intermediate connection. Figure 1 , 2 As shown in FIGS. 3A and 3B, the straight-mouth connection assembly 30 has a sleeve along the Z-axis direction and is installed inside the first cavity 21 of the Z-axis adjustment assembly.

[0047] Combination Figure 1 , 3A As shown in FIG. 3B , a guide groove 22 is provided on the inner wall of the first cavity 21 of the Z-axis adjustment assembly 20 along the Z-axis direction, and a guide member 31, such as a positioning pin, is provided on the outer wall of the sleeve of the straight-mouth connection assembly 30 to cooperate with the guide groove. The guide member 31 can move in the direction and space defined by the guide groove. Thus, it can play a guiding role during adjustment.

[0048] Therefore, during the debugging process, the position adjustment of the entire wide-band powder feeding device can be quickly achieved in the Z-axis direction.

[0049] The first water cooling assembly 40, such as Figure 3A , having a second cavity 41 along the Z-axis direction, and the straight-mouth connection component 30 is fixedly connected to one end of the first water-cooling component 40 .

[0050] The nozzle body 10 has side plates 11 symmetrically arranged along a first predetermined direction. Figure 1 As shown in FIGS. 3A and 3B , the aforementioned first predetermined direction, especially the direction orthogonal to the Z axis and defined by the center line connecting the two side plates 11 , is the X direction.

[0051] like Figure 1 The other end of the first water cooling assembly 40 is fixed on the side plate 11 .

[0052] Thus, the Z-axis adjustment assembly 20, the straight port connection assembly 30, the first water cooling assembly 40 and the nozzle body 10 are assembled and installed in sequence.

[0053] like Figure 1 , 2 As shown, the baffle 50, in particular, a rectangular baffle member, is arranged orthogonally to the Z axis and has a center hole along the Z axis, and the nozzle body is embedded in the center hole. Therefore, the baffle 50, as an anti-splash design of the nozzle device, can effectively prevent the damage to the pipeline on the nozzle caused by laser reflection and splashes generated during processing, effectively reduce the wear of the nozzle by the powder during use, and ensure the use effect of the powder feeding nozzle.

[0054] The wide-band powder feeding assembly 60 is symmetrically arranged on both sides of the nozzle body 10 along a second predetermined direction, and the second predetermined direction is orthogonal to the first predetermined direction and serves as the Y direction.

[0055] Combination Figure 1 , 3A, 3B, the center hole of the baffle 50, the second cavity 41 of the first water-cooling assembly 40, the sleeve of the straight-mouth connection assembly 30 and the first cavity 21 of the Z-axis adjustment assembly 20 are arranged coaxially along the Z-axis direction, and the broadband laser beam passes through the sleeve, the second cavity 41 and the nozzle body 10, and is projected onto the substrate below the nozzle body for cladding processing.

[0056] Combination Figure 1 The wide-band powder feeding assembly 60 is installed integrally with the nozzle body 10 and embedded in the central hole of the baffle 50 , and a connector, such as an L-shaped connector, is arranged on the outer side of each side plate 11 to fix the nozzle body and the baffle.

[0057] Optionally, the central hole of the baffle 50 is a square hole with a cone angle, and the nozzle body is located in the center of the square hole.

[0058] 1 , 3A, and 3B, each wide-band powder feeding assembly 60 is mounted on the side plate 11 of the corresponding side of the nozzle body at a predetermined angle to the baffle 50 , and can be adjusted in position along the direction of the predetermined angle.

[0059] Preferably, the angle θ between the wide-band powder feeding assembly 60 and the baffle 50 is set at 60° to 85°.

[0060] In an optional embodiment, the baffle 50 is made of a copper plate and is designed with a water cooling component. The water cooling component is configured with an independent water cooling channel and water inlet and outlet interfaces to achieve the purpose of cooling the baffle.

[0061] In conjunction with the illustration, each side plate 11 is provided with a narrow slot 15 along a predetermined angle direction on the side corresponding to the wide-band powder feeding assembly, and the surface of the wide-band powder feeding assembly facing the side plate is provided with an adjusting bolt for position adjustment, which passes through the narrow slot and is releasably tightened to the wide-band powder feeding assembly.

[0062] like Figure 1 , 3A As shown in 3B, the adjusting screw can be operated to switch between a released state or a tightened state, wherein: in the released state, the adjusting bolt and the wide-band powder feeding assembly move synchronously in the predetermined angle direction limited by the narrow slot to achieve position adjustment, wherein the adjusting bolt and the narrow slot cooperate to guide during the movement; after the adjusting bolt and the wide-band powder feeding assembly move to the predetermined position, the adjusting screw is tightened to switch to the tightened state to achieve locking and fixation.

[0063] In an optional embodiment, a positioning structure 12 may be provided inside the nozzle body, such as Figure 3AAs shown, the positioning structure 12 is designed as a stop bar along the aforementioned predetermined angle direction. On the one hand, a screw hole can be designed on the top of the stop bar to cooperate with the first water cooling component 40 for fixed connection. On the other hand, the broadband powder feeding component can be positioned and limited by the stop bar when installed on the nozzle body 10, thereby ensuring the inclination angle of the broadband powder feeding component installed on one side and improving the assembly accuracy.

[0064] In an optional embodiment, an air inlet is provided on the Z-axis adjustment assembly 20 for introducing protective gas, and an inclination angle is provided inside the nozzle body 10 to achieve a guiding and converging effect on the protective gas.

[0065] In an optional embodiment, combining Figure 1 As shown, a water cooling assembly is provided on the Z-axis adjustment assembly 20, and a water cooling channel is provided inside to further cool the nozzle device. The water cooling assembly is provided with independent water inlet and outlet interfaces.

[0066] Combination Figure 3A , 3B And Figure 4, Figure 5 As shown, the broadband powder feeding assemblies 60 are installed symmetrically, and each broadband powder feeding assembly 60 has a powder feeder body 61, a cover plate 62, a powder feeding block 63, a quartz tube 64 and a cascade powder distribution assembly.

[0067] The powder feeding block 63 and the cascade powder distribution assembly are fixed in sequence on the top of the powder feeder body 61. The cascade powder distribution assembly is located between the powder feeding block 63 and the top of the powder feeder body 61.

[0068] The powder feeding block 63 is arranged to be connected to the powder feeding pipe 70 to receive the powder, especially the metal powder, delivered by the powder feeding barrel.

[0069] like Figure 4A , 4B As shown, the powder feeding block 63 is provided with through holes communicating with the powder feeding pipe 70 , and the number of through holes is N0. In the example shown in the figure, two through holes are used as an example for explanation, but the implementation of the embodiment of the present invention is not limited to two through holes.

[0070] A second water cooling assembly and a flat rectangular groove are provided in the powder feeder body 61. An independent water cooling channel is provided inside the second water cooling assembly to cool the powder feeder body 61, and is provided with water inlet and outlet interfaces as shown in the figure, wherein the water inlet is 69a and the water outlet is 69b.

[0071] like Figure 4A , 4B As shown, a plurality of quartz tubes 64 are arranged in parallel in the rectangular groove to form a flat arrangement plane, which is covered and sealed by a cover plate 62 .

[0072] As shown in the figure, the inlet ends of the multiple quartz tubes 64 face the cascade powder distribution assembly, and the outlet ends face the lower end of the nozzle body for powder discharge. When in use, the metal powder enters the cascade powder distribution assembly from the powder inlet block, is distributed by the cascade powder distribution assembly, and is sent to the quartz tube, and then sent to the molten pool below the nozzle body through the quartz tube.

[0073] Combination Figure 4A , 4B as well as Figure 5 As shown, the cascade powder separation assembly includes a powder separation block 65 and a sealing gasket 66 arranged between two adjacent layers of powder separation blocks. The powder separation block 65 has powder separation holes 67. The powder separation holes of the powder separation blocks of two adjacent layers are staggered layer by layer, and the number of powder separation holes of the powder separation block 65 of the bottom layer is consistent with the number of quartz tubes 64.

[0074] Combination Figure 5-7 As shown, the powder distribution holes 67 provided on each layer of the powder distribution blocks 65 of the cascade powder distribution assembly adopt a double-layer design of a flat countersunk hole 67a and an oblique cone-shaped powder outlet hole 67b. The flat countersunk hole is located above the oblique cone-shaped powder outlet hole and is smoothly connected. In the powder distribution hole structure design on each layer of the powder distribution block, the aperture of the flat countersunk hole 67a is larger than the aperture of the outlet end 67c of the oblique cone-shaped powder outlet hole 67b.

[0075] Combination Figure 5 , 6 As shown, the upper part of the oblique cone-shaped powder outlet hole 67b is connected to the lower edge of the flat counterbore 67a, and a sloped powder falling design is formed at a set angle from the lower edge of the flat counterbore to the outlet end 67c of the powder outlet hole.

[0076] As a result, the powder flows smoothly along the cone angle slope to the next layer of powder separation blocks.

[0077] In the cascade powder distribution assembly of the exemplary embodiment of the present invention, a particularly preferred design requires smooth and gentle powder falling between the powder distribution blocks of the next layer and the powder distribution blocks of the previous layer, and a design that is not easy to cause powder blockage, thereby preventing powder feeding failures during the additive manufacturing printing process from causing problems in the printing process.

[0078] As an optional solution, each layer of powder separation blocks in the cascade powder separation assembly needs to be designed so that the total length of the flat countersunk holes of the powder separation blocks of the next layer is greater than the total length of the outlet ends of the oblique cone-shaped powder outlet holes of the powder separation blocks of the previous layer, and there is no border or flat surface between any two adjacent flat countersunk holes to prevent accumulation or blockage.

[0079] In a particularly preferred embodiment, the center position of the connecting line between any two adjacent flat countersunk holes is located at the position where the center of the flat countersunk hole of the powder separation block of the previous layer and the oblique cone powder outlet hole 67b overlap, thereby ensuring that the powder of the previous layer falls evenly and can be respectively distributed to the oblique cone powder outlet holes 67b of the next layer, and then fall into the powder separation blocks of the next layer.

[0080] As an alternative, combine Figure 4A-4B as well as Figure 5-7 As shown, the powder distribution holes provided on each layer of the powder distribution blocks of the cascade powder distribution assembly are configured to satisfy:

[0081] like Figure 4A , Figure 5 , 6 As shown, the number of powder separation holes of the first layer of powder separation blocks is N1, N1>N0, the flat countersunk holes between the N1 powder separation holes are connected in series side by side, and the adjacent powder separation holes are directly connected in the horizontal direction and have a frameless design; and the centers of the connection positions of the adjacent flat countersunk holes of the first layer of powder separation blocks are aligned with the centers of the circles of the corresponding through holes on the powder separation blocks, and the length of the adjacent flat countersunk holes after cascading is greater than the size length of the edge connection line of the N0 through holes on the powder feeding block in the horizontal direction;

[0082] The number of powder separation holes in the middle layer powder separation block is N i , N i Indicates the number of powder separation holes in the i-th layer, N i >N i-1 ; i≤m, m is the total number of powder blocks; N i The flat countersunk holes of the powder separation holes are connected in parallel in series, and the adjacent powder separation holes are directly connected in the horizontal direction and have no frame design; the center of the connection position of the adjacent flat countersunk holes of the i-th layer of powder separation blocks is aligned with the center of the outlet end of the corresponding oblique cone-shaped powder outlet hole on the i-1th layer, and the length of the adjacent flat countersunk holes after cascading is greater than the N of the i-1th layer i-1 The length of the edge connection line in the horizontal direction of the powder outlet of each powder outlet hole;

[0083] The length of the flat countersunk holes of the powder separation holes arranged on the next layer of powder separation blocks after cascading is greater than the length of the edge connection line of the outlet ends of the powder outlet holes of the previous layer of powder separation blocks after cascading.

[0084] like Figure 5 , 6 As shown in 7, the powder distribution holes provided on each layer of the powder distribution blocks of the cascade powder distribution assembly meet the following requirements:

[0085] The diameter of the flat countersunk holes of the powder separation holes of each layer of powder separation blocks is smaller than the diameter of the flat countersunk holes of the powder separation holes of the previous layer of powder separation blocks, and decreases layer by layer;

[0086] The aperture of the outlet end of the powder outlet hole of each layer of powder distribution blocks is smaller than the aperture of the outlet end of the powder outlet hole of the previous layer of powder distribution blocks, and decreases layer by layer.

[0087] Combination Figure 4A , 4B as well as Figure 6 As shown, a rectangular through hole 66a is provided on the sealing gasket 66 between the two adjacent layers of powder dividing blocks, and the edge of the rectangular through hole exceeds the edge of the powder dividing holes provided on the two adjacent layers of powder dividing blocks connected thereto.

[0088] Figure 6 Shown Figure 4A , 4B The first layer of powder blocks in the example is shown in the figure. Figure 7 Shown Figure 4A , 4B A top view of the first-level powder block and the second-level powder block of the cascade powder distribution assembly in the example after being combined. Figure 6 , 7 As shown in the figure, the connecting position of the flat countersunk holes 67a of the adjacent powder separation holes of the first-level powder separation block is indicated by the reference numeral 68, and the center thereof is Figure 7 The center point 68a in the upper middle is indicated. Figure 7 Also shown in the figure are the connection positions of the flat countersunk holes of the adjacent powder separation holes of the second layer of powder separation blocks. Figure 7 The reference numeral 68 in the middle and lower part indicates that Figure 7 The mark 68a below indicates the center point of the connection position of the flat countersunk holes of adjacent powder distributing holes of the second layer of powder distributing blocks, and the outlet ends of the corresponding oblique cone-shaped powder outlet holes of the remaining upper layer of powder distributing blocks and the centers of the flat countersunk holes are aligned.

[0089] As shown in the figure, the flat countersunk hole of the powder distributing hole of each layer of the powder distributing block and the outlet end of the oblique cone-shaped powder outlet hole are both designed to be concentric.

[0090] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A cascaded broadband powder feeding assembly of a coaxial broadband powder feeding device, characterized in that: The broadband powder feeding assembly comprises a powder feeder body (61), a cover plate (62), a quartz tube (64), a powder feeding block (63) and a cascade powder distribution assembly; The powder feeding block (63) and the cascade powder distribution assembly are fixed in sequence on the top of the powder feeder body (61); On the same side of the coaxial wide-band powder feeding device, the powder feeding block (63) is connected to the powder feeding pipe (70) to receive the powder to be fed; the powder feeding block (63) has through holes communicating with the powder feeding pipe (70), and the number of through holes is N0; A flat rectangular groove and a water cooling assembly for cooling the powder feeder body (61) are provided in the powder feeder body, a plurality of quartz tubes (64) are arranged in parallel in the rectangular groove to form a flat arrangement plane and are covered and sealed by the cover plate (62), the inlet ends of the plurality of quartz tubes (64) face the cascade powder distribution assembly, and the outlet ends face the lower end of the nozzle body of the coaxial broadband powder feeding device; After the powder feeding block (63) receives the powder, the powder enters the cascade powder separation component, is separated by the cascade powder separation component, and is then fed into a plurality of quartz tubes (64) in the powder feeder body, and is then fed into the molten pool below the nozzle body through the quartz tubes (64); The cascade powder separation component comprises a powder separation block (65) having powder separation holes (67) and a sealing gasket (66) arranged between two adjacent layers of powder separation blocks (65); the powder separation holes (67) of the two adjacent layers of powder separation blocks (65) are arranged alternately layer by layer, and the number of the powder separation holes (67) of the powder separation block (65) in the bottom layer is the same as that of the quartz tube (64).

2. The cascaded broadband powder feeding assembly of the coaxial broadband powder feeding device according to claim 1, characterized in that: The powder distribution holes (67) provided on each layer of the powder distribution blocks (65) of the cascade powder distribution assembly adopt a double-layer design of a flat countersunk hole (67a) and an oblique cone-shaped powder outlet hole (67b); the flat countersunk hole (67a) is located above the oblique cone-shaped powder outlet hole (67b); and the aperture of the flat countersunk hole (67a) is larger than the aperture of the outlet end of the oblique cone-shaped powder outlet hole (67b).

3. The cascaded broadband powder feeding assembly of the coaxial broadband powder feeding device according to claim 2, characterized in that: The upper portion of the oblique cone-shaped powder outlet hole (67b) is connected to the lower edge of the flat countersunk hole (67a), and a sloped powder dropping design is provided at a set angle from the lower edge of the flat countersunk hole (67a) to the outlet end of the oblique cone-shaped powder outlet hole (67b).

4. The cascaded broadband powder feeding assembly of the coaxial broadband powder feeding device according to claim 2, characterized in that: The center position of the connection line between any two adjacent flat countersunk holes (67a) is located at the position where the centers of the flat countersunk holes (67a) and the oblique cone-shaped powder outlet holes (67b) of the upper layer of powder separation blocks overlap, so that the powder of the upper layer falls evenly and can be respectively distributed to the oblique cone-shaped powder outlet holes (67b) of the lower layer, and then falls into the powder separation blocks of the lower layer.

5. The cascaded broadband powder feeding assembly of the coaxial broadband powder feeding device according to claim 2, characterized in that: The flat countersunk holes of the powder distributing holes (67) of each layer of the powder distributing blocks (65) and the outlet ends of the oblique cone-shaped powder outlet holes are designed to be concentric.

6. The cascaded broadband powder feeding assembly of the coaxial broadband powder feeding device according to claim 2, characterized in that: The powder distribution holes provided on each layer of the powder distribution blocks of the cascade powder distribution assembly meet the following requirements: The diameter of the flat countersunk holes of the powder separation holes of each layer of powder separation blocks is smaller than the diameter of the flat countersunk holes of the powder separation holes of the previous layer of powder separation blocks, and decreases layer by layer; The aperture of the outlet end of the oblique cone-shaped powder outlet hole of each layer of powder separation blocks is smaller than the aperture of the outlet end of the oblique cone-shaped powder outlet hole of the previous layer of powder separation blocks, and decreases layer by layer.

7. The cascaded broadband powder feeding assembly of the coaxial broadband powder feeding device according to claim 2, characterized in that: A rectangular through hole is arranged on the sealing gasket between two adjacent layers of powder dividing blocks, and the edge of the rectangular through hole exceeds the edge of the powder dividing holes arranged on the two adjacent layers of powder dividing blocks connected thereto.

8. The cascaded broadband powder feeding assembly of the coaxial broadband powder feeding device according to claim 2, characterized in that: The design of each layer of powder distribution blocks of the cascade powder distribution assembly meets the following requirements: The total length of the flat countersunk holes of the next layer of powder distributing blocks is greater than the total length of the outlet ends of the oblique cone-shaped powder outlet holes of the previous layer of powder distributing blocks, and there is no frame or flat surface between any two adjacent flat countersunk holes.

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