CN215966308U

CN215966308U - Broadband powder feeding assembly for laser cladding additive manufacturing and coaxial broadband powder feeding device

Info

Publication number: CN215966308U
Application number: CN202122638469.6U
Authority: CN
Inventors: 纪楠; 迟海龙; 锁红波; 史建军
Original assignee: Nanjing Zhongke Raycham Laser Technology Co Ltd
Current assignee: Nanjing Zhongke Raycham Laser Technology Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-03-08
Anticipated expiration: 2031-10-29

Abstract

The utility model provides a broadband powder feeding assembly and a coaxial broadband powder feeding device for laser cladding additive manufacturing. Each wide belt powder feeding assembly is arranged on the corresponding side plate at a preset angle with the baffle plate and can be adjusted along the direction of the preset angle. The broadband powder feeding assembly is provided with a powder feeder main body, a quartz tube, a cover plate, a powder feeding block and a cascade powder distributing assembly; the cascade powder dividing assembly comprises powder dividing blocks with powder dividing holes and a sealing gasket positioned between every two adjacent powder dividing blocks, the powder dividing holes of the powder dividing blocks of the two adjacent layers are staggered layer by layer, and the powder dividing holes of the powder dividing block at the lowest layer are consistent with the quartz tubes in number. The coaxial broadband powder feeding device can reduce the abrasion of powder to the nozzle, is convenient to replace after the powder feeding nozzle is abraded, reduces the replacement cost, has good cooling effect and anti-reflection effect, and can be stably used for a long time.

Description

Broadband powder feeding assembly for laser cladding additive manufacturing and coaxial broadband powder feeding device

Technical Field

The utility model relates to the technical field of laser cladding additive manufacturing, in particular to a broadband powder feeding assembly and a coaxial broadband powder feeding device for laser cladding additive manufacturing.

Background

The laser additive manufacturing technology is used as a novel surface strengthening technology, has a wide industrial application range and application fields, is applied to the fields of mining machinery, coal, petrochemical industry, railways, automobiles, ships, metallurgy, aviation, machine tools and the like, can carry out rapid forming and defect repairing on complex parts by adopting the laser additive manufacturing and remanufacturing technology, recovers the service performance, has low cost and high efficiency, can realize the repairing and strengthening of the surfaces of remanufactured parts by a broadband laser cladding technology in some application fields, realizes high strength, wear resistance and erosion resistance, and carries out repairing and performance optimization by using the laser cladding processing technology.

The broad band laser cladding processing technique adopts laser cladding of laser spots of larger area such as rectangular laser spots or oval laser spots to powder, and the powder feeding nozzle adopts broad band type powder feeding, so that the powder spot fed on the substrate is not a circular powder spot any more, but presents a large area of approximate rectangle, and the broad band laser cladding processing technique has the characteristics of short processing time and high working efficiency, especially adopts the coaxial powder feeding laser cladding processing technique, has the characteristics of good cladding surface quality and wide application range, and has wide application in the aspects of repairing and strengthening the surface of parts. However, in the process of long-time use, due to the fact that the metal powder erodes the powder flow channel of the nozzle, the smoothness inside the nozzle is gradually reduced, the powder feeding effect is affected, the powder utilization rate is reduced, and the cladding effect is reduced. In the maintenance and repair process, the whole powder feeding nozzle needs to be replaced, so that the replacement cost and the replacement difficulty are greatly improved. Moreover, a large amount of heat conduction can be caused to the powder feeding nozzle after long-time use, and the pipeline on the nozzle can be damaged due to the reflection of the laser on the workpiece, so that the using effect is seriously influenced.

In the prior art, a wide-band coaxial laser cladding powder feeding nozzle is provided, for example, a full-water-cooling high-power wide-band coaxial laser cladding nozzle provided with the publication number of CN211227345U, and a powder distribution module assembly is designed to divide all the powder introduced into a powder feeding port into multiple paths, so that the powder introduced into the powder feeding nozzle is changed into a wide powder band, and after the wide powder band is converged and melted with laser, a wider repair band can be formed on the surface of a substrate, thereby greatly increasing the efficiency of laser cladding repair, saving the production time and improving the production benefit, and solving the problems of small powder feeding amount, small powder feeding area and low processing efficiency of a common laser cladding nozzle. Particularly, the transverse water channel is arranged on the powder distributing module, the longitudinal water channel is arranged on the water-cooling side plate, so that an all-around water-cooling structure is formed inside the whole laser cladding nozzle, the requirement of full water cooling during laser cladding processing can be met, and the requirement of long-time laser cladding processing is met. However, in the design, due to the fixed design of the powder feeding structure and the powder distributing structure and the flat fixed 1-to-3 (1-to-N) structure formed in the powder distributing module assembly, the powder distributing structure is fixed in the powder distributing and powder conveying process and cannot be adjusted according to needs or processes, adjustment and adjustment are not easy, blockage is easy to cause, and once the powder feeding structure is damaged or blocked, the whole powder feeding nozzle assembly needs to be replaced. Meanwhile, in the using process, the powder feeding nozzle is easy to damage a pipeline on the nozzle due to the fact that laser light reflects on a workpiece, and the using effect is affected.

Prior art documents:

patent technique 1: CN211227345U coaxial laser cladding mouth of full water-cooling high power broadband

Patent technology 2: CN203878217U laser cladding head with full water-cooling powder feeding nozzle

SUMMERY OF THE UTILITY MODEL

The first aspect of the utility model provides a broadband powder feeding assembly for laser cladding additive manufacturing, which comprises a powder feeder main body, a quartz tube, a cover plate, a powder feeding block and a cascade powder distributing assembly;

the powder feeding block and the cascade powder distributing assembly are sequentially fixed on the top of the powder feeder main body;

the powder feeding block is arranged and connected with the powder feeding pipe; the powder feeding block is provided with through holes communicated with the powder feeding pipe, and the number of the through holes is N₀；

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

the cascade powder dividing assembly comprises powder dividing blocks and a sealing gasket arranged between every two adjacent powder dividing blocks, each powder dividing block is provided with a powder dividing hole, the powder dividing holes of the adjacent two layers of powder dividing blocks are arranged in a staggered mode layer by layer, and the powder dividing holes of the powder dividing block at the lowest layer are consistent with the number of quartz tubes.

Therefore, after the powder is conveyed into the powder conveying block through the powder conveying pipe, the powder enters the cascade powder distributing assembly, and the powder is uniformly and quickly distributed in multiple staggered layers through the powder distributing holes in staggered arrangement layer by layer, so that the broadband powder conveying is realized.

Preferably, the powder dividing holes arranged on each layer of powder dividing block of the cascade powder dividing assembly are designed in a double-layer mode of a flat counter bore and an oblique cone-shaped powder outlet hole, the flat counter bore is located above the oblique cone-shaped powder outlet hole, and the aperture of the flat counter bore is larger than that of the outlet end of the oblique cone-shaped powder outlet hole.

Preferably, the upper part of the oblique cone-shaped powder outlet hole is connected with the lower edge of the flat counter bore, and the upper part of the oblique cone-shaped powder outlet hole is in a slope powder falling design from the lower edge of the flat counter bore to the outlet end of the powder outlet hole at a set angle.

Preferably, the powder distributing holes arranged on each layer of powder distributing block of the cascade powder distributing assembly are arranged to satisfy the following conditions:

the number of the powder dividing holes of the first layer of the powder dividing block is N₁，N₁＞N₀，N₁The flat counter bores among the powder dividing holes are connected in series side by side, adjacent powder dividing holes are directly communicated in the horizontal direction, and no frame is arranged; the center of the connecting position of the adjacent flat counter bores of the first layer of powder dividing block is aligned with the circle center of the corresponding through hole on the powder dividing block, and the length of the adjacent flat counter bores after being cascaded is larger than N on the powder conveying block₀The size length of the edge connecting line in the horizontal direction of each through hole;

the number of the powder dividing holes of the middle layer powder dividing block is N_i，N_iIndicates the number of powder separation holes of the ith layer, N_i＞N_i-1(ii) a i is less than or equal to m, and m is the total number of the powder dividing blocks; n is a radical of_iThe flat counter bores of the powder dividing holes are connected in series side by side, adjacent powder dividing holes are directly communicated in the horizontal direction, and no frame is arranged; the center of the connecting position of the adjacent flat counter bores of the ith layer of powder dividing block is aligned with the circle center of the outlet end of the corresponding inclined cone-shaped powder outlet hole on the (i-1) th layer, and the length of the adjacent flat counter bores after being cascaded is greater than N of the (i-1) th layer_i-1The size length of the edge connecting line of the powder outlet of each powder outlet hole in the horizontal direction;

the length of the cascaded flat counter bores of the powder dividing holes arranged on the lower layer of powder dividing block is larger than the size length of the edge connecting line of the cascaded outlet ends of the powder outlet holes of the upper layer of powder dividing block.

From this, at the staggered floor powder splitting in-process, through the staggered floor design and the size matching of the branch powder hole of dividing the powder piece, both guaranteed the smooth transition between the upper and lower floor powder splitting piece, realized the smooth and easy falling powder between the upper and lower floor powder splitting piece simultaneously, avoid powder piling up or blockking up in inside.

Preferably, the powder distributing holes arranged on each layer of powder distributing block of the cascade powder distributing assembly satisfy the following conditions:

the aperture of the flat counter bore of the powder dividing hole of each layer of the powder dividing block is smaller than that of the flat counter bore of the powder dividing hole of the previous layer of the powder dividing block, and the hole diameters are gradually decreased layer by layer;

the aperture of the outlet end of the powder outlet hole of each layer of powder dividing block is smaller than that of the outlet end of the powder outlet hole of the previous layer of powder dividing block, and the hole diameters decrease gradually layer by layer.

Preferably, a rectangular through hole is formed in the sealing gasket between the two adjacent layers of powder dividing blocks, and the edge of the rectangular through hole exceeds the edge of the powder dividing hole formed in the two adjacent layers of powder dividing blocks connected with the rectangular through hole.

From this, through dividing the gasket that sets up between the powder piece, seal through seal gasket on the one hand, prevent that the powder from spilling, on the other hand guarantees smoothly falling powder between the powder piece of branch of adjacent layer simultaneously.

The second aspect of the present invention further provides a coaxial broadband powder feeding device for laser cladding additive manufacturing, including:

a Z-axis adjustment assembly formed with a first cavity along a Z-axis direction, the Z-axis adjustment assembly configured for mounting to an additive manufacturing laser assembly, the laser assembly configured to emit a broadband laser beam through the first cavity along the Z-axis direction;

a straight-mouth connecting assembly, which is provided with a sleeve along the Z-axis direction, wherein the sleeve is movably arranged in the first cavity of the Z-axis adjusting assembly;

the first water cooling assembly is provided with a second cavity along the Z-axis direction, and the straight connecting assembly is fixedly connected to one end of the first water cooling assembly;

the nozzle body is provided with side plates which are symmetrically arranged along a first preset direction, and the opposite other ends of the first water cooling assemblies are fixed on the side plates;

a baffle plate disposed orthogonally to the Z-axis and having a center hole along the Z-axis direction, the nozzle body being embedded in the center hole; and

the wide-band powder feeding assemblies are symmetrically arranged on two sides of the nozzle body along a second preset direction, and the second preset direction is orthogonal to the first preset direction; the wide-band powder feeding assembly adopts any one of the design structures;

wherein the central hole, the second cavity, the sleeve and the first cavity are coaxially arranged along the Z-axis direction;

each wide belt powder feeding assembly is mounted to the side plate of the corresponding side of the nozzle body at a predetermined angle to the baffle plate, and is positionally adjustable in the direction of the predetermined angle.

Preferably, each side plate is provided with a slot along a predetermined angular direction on its side corresponding to the wide belt powder feeding assembly, the surface of the wide belt powder feeding assembly facing the side plate being provided with an adjustment bolt for position adjustment, the adjustment bolt passing through the slot and being releasably screwed onto the wide belt powder feeding assembly.

During selection and adjustment of the powder feeder, the adjustment bolt is released to allow relative movement between the broad band powder feeder assembly and the corresponding side plate, thereby allowing rapid positional adjustment along a predetermined angular direction, within an angle and range defined by the slot as will be described in more detail below. After the adjustment is in place, the adjusting bolt can be screwed down again for locking and fixing.

Preferably, a stop strip along the preset angle direction is arranged in the nozzle main body, so that the wide-belt powder feeding assembly can be installed and positioned.

Preferably, a guide groove is formed in the inner wall of the first cavity of the Z-axis adjusting assembly along the Z-axis direction, a guide piece in guide fit with the guide groove is arranged on the outer wall of the sleeve of the straight-opening connecting assembly, and the guide piece can move in the direction and in the space defined by the guide groove.

The coaxial broadband powder feeding device for the optical cladding additive manufacturing can reduce the abrasion of powder to the nozzle in use, and only needs to be replaced after the quartz tube for feeding the powder is abraded without replacing the rest part of the nozzle, so that the replacement cost can be greatly reduced, the powder feeding nozzle is simple and convenient to replace after being abraded, the replacement cost is reduced, and the coaxial broadband powder feeding device has good cooling effect and anti-reflection effect and can be stably used for a long time.

It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the inventive subject matter of this disclosure.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 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.

Fig. 2 is a top view of the coaxial broad-band powder feeding device for laser cladding additive manufacturing in the embodiment of fig. 1.

Fig. 3A-3B are schematic exploded structural views of the coaxial broadband powder feeding device for laser cladding additive manufacturing in the embodiment of fig. 1.

Fig. 4A-4B are schematic diagrams of a broad-band powder feeding assembly of a coaxial broad-band powder feeding device for laser cladding additive manufacturing in the embodiment of fig. 1.

Fig. 5 is a schematic diagram of a powder dividing block of a cascade powder dividing assembly of the broadband powder feeding assembly of the coaxial broadband powder feeding device for laser cladding additive manufacturing in the embodiment of fig. 1.

Fig. 6 is a schematic diagram of a first stage powder separation block of a cascade powder separation assembly of the broadband powder feeding assembly of the coaxial broadband powder feeding device for laser cladding additive manufacturing in the embodiment of fig. 1.

Fig. 7 is a top view of the cascade powder dividing block and the second powder dividing block of the broadband powder feeding assembly of the coaxial broadband powder feeding device for laser cladding additive manufacturing in the embodiment of fig. 1 after being combined.

Detailed Description

In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.

In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the utility model. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.

The coaxial broadband powder feeding device for laser cladding additive manufacturing, which is combined with the exemplary embodiment shown in fig. 1 to 7, comprises a nozzle body 10, a Z-axis adjusting assembly 20, a straight-mouth connecting assembly 30, a first water cooling assembly 40, a baffle 50 and a broadband powder feeding assembly 60.

As shown in fig. 1 and 2, the Z-axis adjustment assembly 20 is designed to be coupled to other components of a laser cladding additive manufacturing system, such as a laser assembly for additive manufacturing.

Referring to fig. 1, the upper end of the Z-axis adjusting assembly 20 has an annular positioning portion for guiding and abutting the laser assembly for installation and fixation. The inside of the Z-axis adjusting assembly 20 is designed as a hollow structure, and a first cavity 21 along the Z-axis direction is formed inside. The laser assembly may emit a broadband laser beam through the first cavity in the Z-axis direction for broadband cladding.

The straight connecting component 30 plays a role of intermediate connection. As shown in fig. 1, 2, 3A and 3B, the straight connecting assembly 30 has a sleeve along the Z-axis direction, and is installed inside the first cavity 21 of the Z-axis adjusting assembly.

As shown in fig. 1, 3A and 3B, the inner wall of the first cavity 21 of the Z-axis adjusting assembly 20 is provided with a guide groove 22 along the Z-axis direction, and the outer wall of the sleeve of the straight-opening connecting assembly 30 is provided with a guide member 31, such as a positioning pin, which is guided to cooperate with the guide groove, and the guide member 31 can move in the direction and space defined by the guide groove. Thereby, the guiding function can be played during the adjustment.

Therefore, in the debugging process, the position of the whole broadband powder feeding device can be quickly adjusted in the Z-axis direction.

The first water cooling module 40, as shown in fig. 3A, has a second cavity 41 along the Z-axis direction, and the straight connecting module 30 is fixedly connected to one end of the first water cooling module 40.

And a nozzle body 10 having side plates 11 arranged along a first predetermined direction and symmetrically. As shown in fig. 1, 3A and 3B, the first predetermined direction is, in particular, a direction orthogonal to the Z axis and defined by a line connecting centers of the two side plates 11, and is taken as the X direction.

As shown in fig. 1, the opposite end of the first water cooling unit 40 is fixed to the side plate 11.

Thus, the Z-axis adjusting unit 20, the straight connection unit 30, the first water cooling unit 40, and the nozzle body 10 are sequentially assembled.

As shown in fig. 1 and 2, the baffle 50, particularly, a rectangular baffle member, is provided orthogonally to the Z axis and has a center hole along the Z axis direction, into which the nozzle body is fitted. From this, baffle 50 is as nozzle device's the design of preventing splashing, can effectively avoid the damage of the pipeline on the nozzle that splashes that produces in the laser reflection sum processing, and powder is to the wearing and tearing of nozzle when effectual reduction is used, guarantees to send whitewashed nozzle result of use.

The wide-band powder feeding members 60 are symmetrically provided on both sides of the nozzle body 10 along a second predetermined direction orthogonal to the first predetermined direction as the Y direction.

Referring to fig. 1, 3A and 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 coaxially arranged along the Z-axis direction, and a broadband laser beam passes through the sleeve, the second cavity 41 and the nozzle body 10 and is projected onto a substrate below the nozzle body to perform a cladding process.

Referring to fig. 1, the wide belt powder feeding assembly 60 is integrally installed with the nozzle body 10 and inserted into the central hole of the baffle 50, and a connecting member, for example, an L-shaped connecting member, is disposed at the outer side of each side plate 11 to fixedly connect the nozzle body and the baffle.

Optionally, the central aperture of the baffle 50 is a square aperture with a taper angle, and the nozzle body is centrally located in the square aperture.

Referring to fig. 1, 3A, and 3B, each of the wide powder feeding assemblies 60 is attached to the side plate 11 on the corresponding side of the nozzle body at a predetermined angle to the baffle 50, and is positionally adjustable in the direction of the predetermined angle.

Preferably, the angle θ between the wide belt powder feeding assembly 60 and the baffle 50 is set to 60 ° to 85 °.

In an alternative embodiment, the baffle 50 is a copper plate, and is designed with a water cooling assembly, and the water cooling assembly is configured with an independent water cooling channel and a water inlet/outlet interface, so as to achieve the purpose of cooling the baffle.

In connection with the illustration, each side plate 11 is provided with a slot 15 in a predetermined angular direction on its side corresponding to the wide belt powder feed assembly, the surface of the wide belt powder feed assembly facing the side plate being provided with an adjusting bolt for position adjustment, which passes through the slot and is releasably screwed to the wide belt powder feed assembly.

As shown in fig. 1, 3A, 3B, the adjusting screw can be operated to switch between a released or tightened state, in which: in a release state, the adjusting bolt and the wide belt powder feeding assembly synchronously move in a preset angle direction defined by the slot to realize position adjustment, wherein the adjusting bolt is matched with the slot for guiding in the moving process; after adjusting bolt and broadband send whitewashed subassembly to remove to the predetermined position, through screwing up adjusting screw, switch to the state of screwing up, realize locking fixedly.

In an alternative embodiment, a positioning structure 12 may be disposed inside the nozzle body, as shown in fig. 3A, the positioning structure 12 is designed as a blocking strip along the predetermined angle direction, and is matched with the wideband powder feeding assembly on the corresponding side, on one hand, a screw hole matched with the first water cooling assembly 40 for fixed connection may be designed at the top of the blocking strip, and on the other hand, when the wideband powder feeding assembly is mounted on the nozzle body 10, the blocking strip may be used for positioning and limiting, so as to ensure the mounting inclination angle of the wideband powder feeding assembly on a single side, and improve the assembly accuracy.

In an alternative embodiment, the Z-axis adjusting assembly 20 is provided with an air inlet hole configured to introduce shielding gas, and the nozzle body 10 is provided with an inclination angle inside, so that the shielding gas can be guided and converged.

In an alternative embodiment, as shown in fig. 1, a water cooling assembly is disposed on the Z-axis adjusting assembly 20, and a water cooling channel is disposed inside the water cooling assembly, so as to further cool the nozzle device. The water cooling component is provided with independent water inlet and outlet interfaces.

As shown in fig. 3A and 3B and fig. 4 and 5, the wide-band powder feeding assemblies 60 are symmetrically installed, and each of the wide-band powder feeding assemblies 60 has a powder feeder main body 61, a cover plate 62, a powder feeding block 63, a quartz tube 64, and a cascade powder dividing assembly.

The powder feeding block 63 and the cascade powder distributing assembly are sequentially fixed on the top of the powder feeder main body 61. The cascade powder dividing assembly is located between the powder feeding block 63 and the top of the powder feeder main body 61.

And a powder feeding block 63 which is connected with the powder feeding pipe 70 and receives powder, especially metal powder, conveyed by the powder feeding barrel.

As shown in FIGS. 4A and 4B, the powder feeding block 63 is provided with through holes N in number communicating with the powder feeding pipe 70₀In the illustrated example, 2 through holes are taken as an example for explanation, but the implementation of the embodiment of the present invention is not limited to 2 through holes.

The powder feeder main body 61 is provided with a second water cooling assembly and a flat rectangular groove therein. The second water cooling assembly is internally provided with an independent water cooling channel for cooling the powder feeder main body 61, and is provided with a water inlet and outlet interface exemplarily shown in the figure, wherein the water inlet is 69a, and the water outlet is 69 b.

As shown in fig. 4A and 4B, a plurality of quartz tubes 64 are arranged in parallel in the rectangular recess and form a flat arrangement plane, and are covered and sealed by a cover plate 62.

As shown, the inlet ends of the quartz tubes 64 face the cascade powder distribution assembly, and the outlet ends face the lower end of the nozzle body, so as to discharge powder. When the nozzle is used, metal powder enters the cascade powder distribution assembly from the powder inlet block, is distributed by the cascade powder distribution assembly, is sent into the quartz tube, and is sent into a molten pool below the nozzle main body through the quartz tube.

As shown in fig. 4A and 4B and fig. 5, the cascade powder dividing assembly includes powder dividing blocks 65 and a sealing gasket 66 disposed between two adjacent layers of the powder dividing blocks, each powder dividing block 65 has powder dividing holes 67, the powder dividing holes of the powder dividing blocks of two adjacent layers are staggered layer by layer, and the number of the powder dividing holes of the powder dividing block 65 at the lowest layer is the same as the number of the quartz tubes 64.

As shown in fig. 5 to 7, the powder dividing holes 67 formed in each layer of the powder dividing block 65 of the cascade powder dividing assembly are designed in a double-layer manner by using a flat counter bore 67a and an oblique cone-shaped powder outlet 67 b. The flat counter bore is positioned above the oblique cone-shaped powder outlet hole and is smoothly connected with the oblique cone-shaped powder outlet hole. In the structural design of the powder dividing holes on the powder dividing block of each layer, the aperture of the flat counter bore 67a is larger than that of the outlet end 67c of the oblique cone-shaped powder outlet hole 67 b.

As shown in fig. 5 and 6, the upper portion of the tapered powder outlet 67b is connected to the lower edge of the flat counterbore 67a, and the inclined powder falling design is performed at a predetermined angle from the lower edge of the flat counterbore to the outlet end 67c of the powder outlet.

Thereby, the powder smoothly flows to the next layer of powder separation block along the taper angle slope.

In the cascade powder distribution assembly of the exemplary embodiment of the utility model, particularly, the preferable design requires smooth and gentle powder drop between the next layer of powder distribution block and the previous layer of powder distribution block, and the design is not easy to cause powder blockage, so that the problem of printing process failure caused by powder feeding failure in the additive manufacturing printing process is prevented.

Alternatively, each layer of powder dividing block of the cascaded powder dividing assembly needs to be designed such that the total length of the flat counter bores of the next layer of powder dividing block is greater than the total length of the outlet ends of the tapered powder outlet holes of the previous layer of powder dividing block, and no frame or flat surface is arranged between any two adjacent flat counter bores to prevent accumulation or blockage.

In a particularly preferred embodiment, the center of the connecting line between any two adjacent flat counter bores is located at a position where the centers of the flat counter bore of the previous layer of powder distribution block and the tapered powder outlet hole 67b coincide, so as to ensure that the powder falling from the previous layer is uniform and can be respectively distributed into the tapered powder outlet hole 67b of the next layer, and then fall into the powder distribution block of the next layer.

As an alternative, as shown in fig. 4A-4B and fig. 5-7, the powder dividing holes provided on each layer of powder dividing block of the cascade powder dividing assembly are set to satisfy the following conditions:

as shown in FIG. 4A, FIG. 5 and FIG. 6, the number of powder dividing holes of the first layer of powder dividing block is N₁，N₁＞N₀，N₁The flat counter bores among the powder dividing holes are connected in series side by side, adjacent powder dividing holes are directly communicated in the horizontal direction, and no frame is arranged; the center of the connecting position of the adjacent flat counter bores of the first layer of powder dividing block is aligned with the circle center of the corresponding through hole on the powder dividing block, and the length of the adjacent flat counter bores after being cascaded is larger than N on the powder conveying block₀The size length of the edge connecting line in the horizontal direction of each through hole;

the number of the powder dividing holes of the middle layer powder dividing block is N_i，N_iIndicates the number of powder separation holes of the ith layer, N_i＞N_i-1(ii) a i is less than or equal to m, and m is the total number of the powder dividing blocks; n is a radical of_iThe flat counter bores of the powder dividing holes are connected in series side by side, adjacent powder dividing holes are directly communicated in the horizontal direction, and no frame is arranged; the center of the connecting position of the adjacent flat counter bores of the ith layer of powder dividing block is aligned with the circle center of the outlet end of the corresponding inclined cone-shaped powder outlet hole on the (i-1) th layer, and the length of the adjacent flat counter bores after being cascaded is greater than N of the (i-1) th layer_i-1Edge connecting line of powder outlet hole in horizontal directionLength of dimension (d);

As shown in fig. 5, 6 and 7, the powder distributing holes arranged on each layer of powder distributing block of the cascade powder distributing assembly satisfy the following conditions:

As shown in fig. 4A and 4B and fig. 6, a rectangular through hole 66a is formed in 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 hole formed in the two adjacent layers of powder dividing blocks connected with the rectangular through hole.

Fig. 6 is a schematic diagram of the first-stage powder distribution block in the example of fig. 4A and 4B, and fig. 7 is a schematic diagram of 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 in the example of fig. 4A and 4B. As shown in fig. 6 and 7, the connecting position of the flat counter bore 67a of the adjacent powder dividing holes of the first-stage powder dividing block is indicated by reference numeral 68, and the center thereof is indicated by the upper center point 68a in fig. 7. Meanwhile, the connection position of the flat counter bores of the adjacent powder dividing holes of the second layer of powder dividing block is also shown in fig. 7, the reference numeral 68 at the lower part in fig. 7 is taken as a reference numeral, and similarly, the reference numeral 68a at the lower part in fig. 7 represents the central point of the connection position of the flat counter bores of the adjacent powder dividing holes of the second layer of powder dividing block, and the outlet ends of the corresponding oblique cone-shaped powder outlet holes of the rest previous layer of powder dividing block are aligned with the circle centers of the flat counter bores.

As shown in the figure, the flat counter bore of the powder dividing hole of each layer of powder dividing block and the outlet end of the oblique cone-shaped powder outlet hole are designed concentrically.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A broadband powder feeding assembly for laser cladding additive manufacturing is characterized by comprising a powder feeder main body, a quartz tube, a cover plate, a powder feeding block and a cascade powder distributing assembly;

2. The broadband powder feeding assembly for laser cladding additive manufacturing according to claim 1, wherein the powder dividing holes arranged on each layer of powder dividing block of the cascade powder dividing assembly are designed in a double-layer mode of a flat counter bore and an oblique cone-shaped powder outlet hole, the flat counter bore is located above the oblique cone-shaped powder outlet hole, and the aperture of the flat counter bore is larger than that of the outlet end of the oblique cone-shaped powder outlet hole.

3. The broadband powder feeding assembly for laser cladding additive manufacturing according to claim 2, wherein the upper portion of the oblique cone-shaped powder outlet hole is connected with the lower edge of the flat counter bore, and the oblique cone-shaped powder outlet hole is in a slope powder falling design at a set angle from the lower edge of the flat counter bore to the outlet end of the powder outlet hole.

4. The broadband powder feeding assembly for laser cladding additive manufacturing according to claim 1, wherein the powder dividing holes arranged on each layer of powder dividing block of the cascade powder dividing assembly are arranged to satisfy the following conditions:

5. The broadband powder feeding assembly for laser cladding additive manufacturing according to claim 1, wherein the powder distributing holes formed in each layer of powder distributing block of the cascade powder distributing assembly satisfy the following conditions:

6. The broadband powder feeding assembly for laser cladding additive manufacturing according to claim 1, wherein a rectangular through hole is formed in 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 hole formed in the two adjacent layers of powder distribution blocks connected with the rectangular through hole.

7. A coaxial broadband powder feeding device for laser cladding additive manufacturing is characterized by comprising:

the wide-band powder feeding assemblies are symmetrically arranged on two sides of the nozzle body along a second preset direction, and the second preset direction is orthogonal to the first preset direction; the wide-band powder feeding component adopts the design of any one of claims 1 to 6;

8. The laser cladding additive manufactured coaxial broad band powder feed apparatus of claim 7, wherein each side plate is provided with a slot along a predetermined angular direction on a side thereof corresponding to the broad band powder feed assembly, a surface of the broad band powder feed assembly facing the side plate being configured with an adjustment bolt for position adjustment, the adjustment bolt passing through the slot and being releasably tightened onto the broad band powder feed assembly.

9. The laser cladding additive manufacturing coaxial broad band powder feeding device of claim 7, wherein a stop strip is arranged in the nozzle body along the predetermined angle direction for realizing the installation and positioning of the broad band powder feeding assembly.

10. The laser cladding additive manufacturing coaxial broadband powder feeding device according to claim 7, wherein a guide groove is formed in the inner wall of the first cavity of the Z-axis adjusting assembly along the Z-axis direction, a guide piece in guiding fit with the guide groove is arranged on the outer wall of the sleeve of the straight-mouth connecting assembly, and the guide piece can move in the direction and space defined by the guide groove.